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turysal
New User
Sep 9, 2012, 5:08 PM
Post #1 of 5
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1994 Olds 88, no spark
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1994 Oldsmobile 88, 3.8, 150k mileage.
Recently did oil change, tune up, new spark wires and plugs, took it for a test drive and check engine light came on, (loss of horsepower then died). Start up right away. Week later did same thing, took it to my friend did a diag. check. Throttle position sensor was bad. Replaced it. Car felt better. week or so later, then check engine light came on, loss of horsepower, after driving 10 min or so, went like that for a couple of days while driving then completely died three days ago with the same symptoms I described above all within the span of 10 sec from my house to the corner street. Replaced with new battery because it was old and drained it trying start up again. Noticed I did not hear fuel pump prime anymore. So checked relays, fuse and fuel pressure, and replaced it along new fuel filter and now it primes and we got fuel pressure. Still won't start. Tested voltage at fuel injectors, it was good. No spark coming from ignition control module (ICM), took it out and had it tested at Autozone, PepBoys and Oreilly. Passed 3 test and failed 2. Seeing how it passed 3 out of 5 it should at least had started those those 3 out of five times I tested it. Since I'm low on money I need some helpful advice on whether its the ICM. My friend suggested it was the crankshaft sensor, and someone else said the computer on the car died. as well as a timing chain issue. However I was warned by the check engine light prior to it dying and the loss of horsepower while driving prior to it dying. Any advice? I found a way to get rid of all the car problems right now by pushing it off a cliff but unfortunately I need it for work.
P.s. I'm thinking the "security" (my key has a little metal thing on it) feature which kills my car is the culprit, but if it is engaged won't it also disengage fuel as well.
(This post was edited by turysal on Sep 9, 2012, 5:15 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 9, 2012, 5:24 PM
Post #2 of 5
(5119 views)
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Re: 1994 Olds 88, no spark
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You don't have a security system problem.
You need to follow these instructions.
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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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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turysal
New User
Sep 10, 2012, 1:41 PM
Post #3 of 5
(5060 views)
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Re: 1994 Olds 88, no spark
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Fuel pressure is good, injectors good and were tested for power and were receiving it but no ground. New fuel pump as of yesterday.
Compression gauge readings good for an engine with this many miles.
Ran spark plug test through each wire, no spark. Took ignition control module out and had it tested at three different place, Autozone, pepboys, oreilly. Failed the two test at Oreilly but passed test at Autozone and Pepboys.
Replaced Crankshaft Sensor right now. Still no start.
I'm almost out of money and buying a new Icm and finding out that not it would be bad (financially) since most stores don't allow return for such items.
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turysal
New User
Sep 10, 2012, 2:24 PM
Post #4 of 5
(5056 views)
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Re: 1994 Olds 88, no spark
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Also forgot to mention, there is power going to the ICm. had the wires leads going to icm tested.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 10, 2012, 2:59 PM
Post #5 of 5
(5052 views)
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Re: 1994 Olds 88, no spark
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I don't want to hear this is good and that is good. I want to hear specific numbers and specific test results and how they were done.
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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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