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zigt59
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Jul 4, 2012, 7:51 AM
Post #1 of 25
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97 Ranger no power
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1997 Ford Ranger Splash with a 2.3 engine and has 200k miles
I have two different problem with my son's truck, we have had this truck for about 1 1/2 years and it has been maintained well, but I do not have any of the previous records of the other owners.
#1 Problem - Has been going on for some time (one year) in hot weather after he has run the truck for 5 or 10 mins, if he shuts it off and returns like after fueling it will not restart until it cools off. This does not happen everytime mind you, sometimes once a week, sometimes once a month. I have changed the fuel filter, checked the fuel psi, changed plugs and wires, cleaned PCV valve, checked vacume, cleaned air intake sensors, cleaned air filter. Out of frustration I took it to a auto mechanic which only cost me two arms and one leg and no results.  I'm not sure what to try next. Does anyone have any suggestions?
#2 Problem - No Power! It just started about two weeks ago according to my son. I took it for a test drive this morning, starting and running the truck sounds good nothing abnormal, but it has no power you can put your foot to the floor poor exceleration and 50 mph is about all the speed I can get out of it. No knocking or pinging!
I'm guessing timing/timing belt?? Does anyone have any suggestions?
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Tom Greenleaf
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Jul 4, 2012, 9:08 AM
Post #3 of 25
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Re: 97 Ranger no power
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Did this mechanic make any suggestions or even take code readings? At 200K this could be on a second round or more of things routinely replaced.
BTW - and IMO, cleaning an air filter isn't really clean and new again,
T
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zigt59
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Jul 4, 2012, 2:06 PM
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Re: 97 Ranger no power
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Reply Problem 1 - Two month ago it had no codes. I went today to Autozone to read the code, the trouble code stored was P1405 = three posibilities 1. failed DPFE sensor 2. open or short circuit, 3. plugged or damaged egr tube. Well I did find one of the DPFE hoses came off. So I fixed that and a minor vac leak.
Went back to Autozone this afternoon to reset the code now I have a P0171 code set a rich or lean condition one engine bank? = 4 possablities 1. bank one and two codes set together suspect fuel psi or MAF sensor 2. O2 sensor 3. ignition misfire-repair 4. fuel injector problem. ?????
Fuel PSI is 32 psi evertime I checked it, I've never been present when my son has had the failed to start when hot problem so I do not know about the PSI or spark!
Sounds like I need to buy a NOID light!
Reply Problem 2 - No it does not sound like, nor can you feel the engine missing. I have not yet checked the fuel PSI while going down the road, I'll have to get a longer hose. At an idle I have 17" of vac, and I have checked a couple of time for leaks. ?????
Where would I check the exhaust back PSI?
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zigt59
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Jul 4, 2012, 2:11 PM
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Re: 97 Ranger no power
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The current codes are in the previous post.
BTW his air filter is a reusable cleanable filter, after cleaning and drying the filter then you put a coating of oil on the filter media and reinstall it. I guess I should have been more specific the first time!
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Hammer Time
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Jul 4, 2012, 2:44 PM
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Re: 97 Ranger no power
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On the "no power" thing, check for restricted exhaust.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
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Jul 4, 2012, 2:45 PM
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Re: 97 Ranger no power
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Yep, it is important to make those checks while the problem is occurring.
Makes you wonder why the DPFE hose was off. That could happen if there is enough back pressure in the exhaust to pop a hose off. One nice thing about Ford DPFE is that it is a nice place to connect a back pressure gauge to. You can also screw one into the O2 sensor bung.
P0171 is lean code. The engine is running lean at some point and it is important to determine which load range caused the code to set. You would have to monitor fuel trim to get an idea if your looking at a vacuum leak problem or a fueling problem. Normally a vacuum leak won't cause loss of power on acceleration, but a fueling problem will.
Fueling problem can be caused from a lot of things such as low fuel pressure/volume, clogged or weak injectors that don't deliver the correct amount of fuel as commanded, MAF sensor lower than normal voltage output problems...etc.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
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Jul 4, 2012, 3:19 PM
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Re: 97 Ranger no power
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And oil all over the Mass Air Flow sensor...............
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
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Jul 4, 2012, 3:34 PM
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Re: 97 Ranger no power
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Yep, definitely oil or contamination on the MAF sensor's resistors can cause fueling problems and lean codes to show up . I don't believe in those oiled cotton reusable air filter for everyday vehicles. Best to stick with what the OEM recommends which is usually the pleated paper design.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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zigt59
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Jul 5, 2012, 6:18 AM
Post #11 of 25
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Re: 97 Ranger no power
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I have used carb cleaner in the past to clean up the MAF sensor, what should I use?
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Hammer Time
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Jul 5, 2012, 6:25 AM
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Re: 97 Ranger no power
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Not carb cleaner
MAF cleaner only
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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zigt59
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Jul 7, 2012, 6:17 AM
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Re: 97 Ranger no power
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Well I replaced the air cleaner with a paper fram filter, cleaned everything up, including using MAF cleaner on the sensor, reset all previous codes. Checked exaust psi running around 0.5 psi. Used the NOID light on the two injectors cables that I could get to, that was good, plus while testing with the NOID light plugged in there was a big difference the engine performace as expected! Ohmed out the two injectors that I could get to 14.68 ohms the book said that was good.
I'm still at a loss on where to go from here. Any suggestions?
I will recheck codes later today. 
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Discretesignals
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Jul 7, 2012, 7:51 AM
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Re: 97 Ranger no power
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What was the back pressure at 2000 rpm?
What is the fuel pressure when the engine is bogging down? You'll have to drive with the gauge taped to the windshield.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 7, 2012, 7:51 AM)
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Hammer Time
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Jul 7, 2012, 8:04 AM
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Re: 97 Ranger no power
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Did it set the PO171 code again?
If so, you have a lean condition. Start looking for a vacuum leak. I seriously doubt that would be the cause of your "no power". If that is an 8 plug engine, make sure you are getting fire to all plugs.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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zigt59
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Jul 7, 2012, 2:11 PM
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Re: 97 Ranger no power
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Exaust pressure was @2000 rpm it was 1.2 psi
Fuel pressure while driving at 55mph was 38 psi pretty much steady until at just an idle then it was at 31 psi
Today I had no codes set?????? Yet!
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zigt59
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Jul 7, 2012, 2:20 PM
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Re: 97 Ranger no power
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No new codes today. I sprayed carb cleaner on connections, joints and intake gasket areas, nothing so far. I put new plugs and wires on it when we bought it about a 1 1/2 years ago when he had his first stalling while hot episode. The engine burns no oil, leaks a little, runs smooth no missing or jerking. Perplexing!!!!!!!!!!
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Discretesignals
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Jul 7, 2012, 2:43 PM
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Re: 97 Ranger no power
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I know this may sound kind of dumb, but make sure the throttle opens all the way with the pedal to the floor.
It could have a timing belt problem if it is a tooth or more retarded. If so, the engine will probably idle ok, but it will be gutless under acceleration.
One thing that I do to see if there is a not enough fuel to the engine under high loads is to watch the O2 sensor voltage with a scan tool. Normally when you WOT (wide open throttle) while driving the O2 voltage should go high or around .9 volts. Even though the computer doesn't use the O2 sensor under WOT conditions, you can still watch the voltage.
Fuel pressure and exhaust pressure looks good. Not enough injector on time or restricted/weak injectors could cause a lean problem. Usually to check to see if injector are flowing good is to compare them to each other using an injector timer tool and your fuel pressure gauge.
Even though the MAF is clean, the voltage from it could be out of range for the amount of air flowing through it. The Ford MAF outputs a 0-5 volt signal to the ECM. MAF sensors are kind of hard to test because a small amount of voltage change has a dramatic effect on how much fuel the ECM puts into the engine. MAF voltage at idle on your truck should be around .6-.9 volts and at 55 should be around 1.5-2.8 volts. Inspect the ducting for cracks, leaks, loose clamps, and unplugged hoses. Make sure there are no air restrictions like plastic bags getting caught up in the air box intake. Any air leaks in the ducting after the MAF will cause the MAF to have a lower voltage output making the ECM think there isn't much air going into the engine.
Sometimes if you think a MAF may be causing a low power condition, you can unplug it and then see if your low power condition goes away. I believe on your set up the computer will resort to a default look up table in the computer's memory to calculate air flow based on other sensor readings. If your power comes back with the MAF unplugged, the MAF is faulty. The engine may stall if you unplug the MAF with it running. May take a few seconds till the computer defaults.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 7, 2012, 3:01 PM)
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zigt59
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Jul 7, 2012, 4:30 PM
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Re: 97 Ranger no power
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What scan tool would you suggest? I do not own one! I'm an electrical engineer by trade, and I have too many cars and trucks around to take everything to the shop! Thanks for the help.
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Discretesignals
Ultimate Carjunky
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Jul 7, 2012, 6:49 PM
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You really don't need anything with bidirectional control and you really don't need to be in the manufacture side. Plus I am sure you don't want to spend a whole bunch of money either.
At work I have an Autel MS310 I use for a pocket rocket. You can view OBD2 PIDs that show MAF grams/sec, ECT, long and short term fuel trim, O2 sensors voltages, and etc. I paid like 80 bucks for it and it plugs into anything with an OBD2 port. It has enough information to give you an idea what is going on. It's a simple scan tool that doesn't have any graphic capabilities like the more expensive models. I don't think it shows MAF voltage, but you can tap in to the MAF with a volt meter, or even better a graphing multimeter and see what kind of signal is coming out of it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 7, 2012, 6:54 PM)
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zigt59
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Jul 8, 2012, 12:17 PM
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Re: 97 Ranger no power
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I unplugged the MAF and run the truck today, it seems the performance greatly in improved. We will see. One thing we have noticed the hotter it was outside the less power the truck had. Today it is in the low 80's, but for the last 8 days it has been around 100 degrees. It seems the MAF sensor uses the thermal difference from both sides of the flow votex as the measurment.
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zigt59
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Jun 29, 2013, 5:06 AM
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Re: 97 Ranger no power
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Finally we noticeed that the harmonic balancer pulley was loose and the keyway was worn and it would allow about 10 degrees of slop thus retarding the timing. I replaced it and life is good, this caused everything.
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Tom Greenleaf
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Jun 29, 2013, 6:11 AM
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Lucky you caught that. Not yet but they can wobble right off and untold damage. Not sure why it harmed the key (woodruff usually) but hope it didn't mess up the crank,
T
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zigt59
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Jun 29, 2013, 9:31 AM
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Re: 97 Ranger no power
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It just ate the pulley keyway and the woodruff key, had to cut the belt pulley off to replace the key. The crank was fine it was made of the harder material.
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