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dragtime92
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Apr 4, 2009, 10:21 AM
Post #1 of 19
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94 S10 Blazer 4x4
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Ok well i just got this blazer and and the acceleration is slow it doesnt stall or nothing its just slow.
I need some tips on why it could be it we thought it would be the plugs.. we changed those little but no
difference still slow at getting up and going. It has a 4.3L V6 Vortex CPI engine has new air filter and plugs as
stated speed sensor is out on it wires are all securely connected dont think any any other sensors are out tho...
But you can floor it and it still just drives like it wasn't floored... as if it was just being drove normal tho. What I need is
tips on why it does this??? I was thinking the torque converter could be going out on it but i'm not for sure on it So any help
would be nice thanxs Dazzed92
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Tom Greenleaf
Ultimate Carjunky
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Apr 4, 2009, 3:22 PM
Post #2 of 19
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Re: 94 S10 Blazer 4x4
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Hmmm? How about testing for exhaust restriction? Converters are the weak link but if so more the result and not the cause in the first place,
T
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dragtime92
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Apr 4, 2009, 3:29 PM
Post #3 of 19
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Re: 94 S10 Blazer 4x4
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ok well im sure there is no exhaust restriction but how bout the oxygen sensor could that be the cause ???
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Tom Greenleaf
Ultimate Carjunky
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Apr 4, 2009, 3:36 PM
Post #4 of 19
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Re: 94 S10 Blazer 4x4
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O2 sensors are capable of delivering too much or too little fuel. Even 1994 should give a code leading that way.
How do you know there's not an exhaust restriction?
Take an actual manifold vacuum reading at idle (should show about 18ish Hgs and again at no load at 2,000-2,500 RPM and readings should be the same. If dramatically lower you have an exhaust restriction,
T
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dragtime92
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Apr 4, 2009, 3:41 PM
Post #5 of 19
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Re: 94 S10 Blazer 4x4
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ok well it gave the reading of the o2 sensor that would cause it the temp sensor is bad i know that then the sped sensor which i know is out
so thats why im asking just say there is no exhaust restriction would the o2 sensor do it cuz it accelerates really slow but still gets up to speed
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Tom Greenleaf
Ultimate Carjunky
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Apr 4, 2009, 3:52 PM
Post #6 of 19
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Re: 94 S10 Blazer 4x4
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The thing is making adjustments based on the info it gets. The o2 will show as it's just sniffing the exhaust. If you know a speed sensor is no good then chase that down.
Temp is also considered. If the engine is being told it's cold all the time it will over fuel so simulate a choke and that would trigger the o2 as well. When an engine runs lousy long enough the cat(s) will plug and o2 sensors will make yet more wrong choices so you need to know if there's an exhaust restriction the old fashioned way - manifold vacuum which is also making adjustment needs to be seen on a gauge. It would still get up to speed just have lots less power so that alone is not a diagnosis,
T
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dragtime92
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Apr 4, 2009, 3:54 PM
Post #7 of 19
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Re: 94 S10 Blazer 4x4
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oic so i start with the possible restriction see if it runs 18s if fine then what and if not fine then what??? sorry
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Tom Greenleaf
Ultimate Carjunky
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Apr 4, 2009, 4:08 PM
Post #8 of 19
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Re: 94 S10 Blazer 4x4
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If you find exhaust restriction and I like to test "actual manifold" vacuum for that as said already then follow why it's plugged. Usually would be a converter and loosening exhaust would relieve that and it would run better for the moment though noisy.
Converters usually have a meltdown when too much is asked of it like raw fuel that it can't handle and it melts down.
Over fueling can be temp sensors, or any so get some codes and follow up on what they say. Plain o2 codes are frequently a result NOT the cause. An o2 sensor AFTER the converter shouldn't be making adjustments. Other sensors would or could,
T
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dragtime92
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Apr 4, 2009, 4:34 PM
Post #9 of 19
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Re: 94 S10 Blazer 4x4
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ok... well i will check that well what about the o2 sensor isnt it before the catalyst converter but we ran like 8 codes through it which was odd tho and couple sensors came up which i had know about and the o2 sensor and came 1st then so on but the final one was odd said transmission would that be the cause of the speed sensor going into the transmison
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Tom Greenleaf
Ultimate Carjunky
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Apr 4, 2009, 5:00 PM
Post #10 of 19
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Re: 94 S10 Blazer 4x4
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Getting tired for the moment - bear with me!
Ok: O2 sensors are like a nose smelling a phart in a crowd! LMAO. It doesn't tell who! By that I mean it's probably after the fact and not the initial cause.
Vehicle puters aren't perfect they give a direction to go - or hope so.
Basics: Adjustments for amount of fuel, timing, idle speed are made via inputs of .... throttle position, temps, gear and speed. When an o2 sensor sees the rich condition it can lean the delivery and vs versa.
Actual manifold vacuum goes to near zero with WOT (wide open throttle) and would have similar reading if exhaust was plugged up tight so confuses it.
Need to know lots to nail down the source in 94 vehicle. Miles, valve timing, and of course the sensors telling the correct info and the dang puter able to make adjustments to be within parameters or a code is set.
I know - it's not making itself easy and the first thing is to know the mechanicals are in line,
T
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Loren Champlain Sr
Veteran
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Apr 5, 2009, 2:12 PM
Post #11 of 19
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Re: 94 S10 Blazer 4x4
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dazed; As Tom mentioned, you need to address the VSS code. This can cause trans. shifting errors. Restricted exhaust can also cause shift faults, but wouldn't cause a VSS code. As far as the O2, you can take out the upstream O2, leave it connected electrically, and test drive the Blazer. If your power is back to normal, its restricted exhaust, which from the symptoms, matches. There are other causes, of course, for severe loss of power, but let's take this a step at a time. Have to taken vacuum readings as Tom suggested? I didn't go back and read all of the posts on this, but have you checked basic stuff? Timing, fuel filter, ect?
Loren
SW Washington
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dragtime92
User
Apr 9, 2009, 2:46 PM
Post #12 of 19
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Re: 94 S10 Blazer 4x4
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ok well i was looking and found a vacuum house that has a bolt shoved in it and guess why i have no clue it back by the backside of the motor and its a short hose so it cant go far and there is a electrical clip off somewhere cant find where back behind the motor to any clue thanxs for the help
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Loren Champlain Sr
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Apr 9, 2009, 2:57 PM
Post #13 of 19
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Re: 94 S10 Blazer 4x4
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Follow the hose back to it's origin. Is it connected to manifold vacuum? What diameter is the hose? 1/8, 1/4, 3/8?
Some 4X4 units require vacuum to engage. I don't think that the '94 uses an external, vacuum operated, modulator. The front differential will have a rubber hose coming from it with what is a check valve in the end of it.
That is a vent for the differential. (the rear one has the same). The check valve is there to keep water out.
Loren
SW Washington
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dragtime92
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Apr 10, 2009, 5:52 AM
Post #14 of 19
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Re: 94 S10 Blazer 4x4
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well acctually when i look closer there are more than one some are really small plastic hoses ??? any clue the hose with the bolt its 3/8 i belleive and it doesent suck or blow air most of the others dont either except one but it has a part on it tried looking for a hose that would go on it but one of the hose go to the cruise control and i dont use it so i didnt bother but all these hoses are confusing??? and there is this one wire with a clip on the back but when u touch it against a red wire it sparks any clue ???
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dragtime92
User
Apr 10, 2009, 6:00 AM
Post #15 of 19
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Re: 94 S10 Blazer 4x4
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and the vss would that tell it to shift or would it shift at all ???? and what all does it do as is tells speed and what else
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Loren Champlain Sr
Veteran
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Apr 10, 2009, 3:30 PM
Post #16 of 19
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Re: 94 S10 Blazer 4x4
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Have you: 1) Taken vacuum readings?
2) Have you found where that vacuum hose with the bolt in it is connected? (not where it goes, because we don't know that, yet).
The small, black plastic hoses are, more than likely, supply hoses for the HVAC system. Unless they are connected to a vacuum source and are sucking vacuum, not a concern at this point.
Loren
SW Washington
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dragtime92
User
Apr 10, 2009, 4:52 PM
Post #17 of 19
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Re: 94 S10 Blazer 4x4
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ok as i am more conserned bout the vss sensor i need to know how fast i am going and all but the hoses seem fine i am prety much broke at the moment and can not afford a vacuum gauge i barely make it by with dads help the sensor i can get cheaper the hose with the bolt in it it does not suck or nothin as i can tell but it would help if u could point me into the direction where the speed sensor is not the abs sensor already messed with it its perfectly fine but what does the speed sensor do in all tells speed and what is that it ???
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Loren Champlain Sr
Veteran
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Apr 10, 2009, 5:35 PM
Post #18 of 19
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Re: 94 S10 Blazer 4x4
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See attachments.
Loren
SW Washington
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Attachments:
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VSS.gif
(25.7 KB)
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VSS1.gif
(26.0 KB)
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dragtime92
User
Apr 11, 2009, 12:03 PM
Post #19 of 19
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Re: 94 S10 Blazer 4x4
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ok heres something interesting the sensor was no where to be found the transmisson stalk at the very end was removed and a transfer case is there and only sensor we found was abs the goes into the stalk but no sensor on there why or how could that be ????
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