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1995 Oldsmobile 88 3.8L no start no codes
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bobgee
Novice
Nov 19, 2011, 5:19 AM
Post #1 of 5
(5304 views)
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1995 Oldsmobile 88 3.8L no start no codes
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1995
Oldsmobile
88
3.8L
122,000mi
Was driving down the freeway when all of a sudden I lost power . Was able to make it back home ok, but it died once at a stop sign.
It ran very rough and sluggish, at idle or under power.
It also seems to be getting worse. A few days after I got it home, I was able to start it again, but it would still run very rough. The other day though, it would barely keep running at all. Now it won't even start, just cranks.
car is showing no codes.
When I put the key to on, I can hear the fuel pump pressure up like normal, then it stops.
I did test the throttle position sensor with a multimeter and got good results with a smooth resistance curve across the movement.
I've also checked fuel pressure. It was reading about 47 psi.
I did get spark from a spark plug with an HEI spark tester.
When this test is good, it should indicate that the crank sensor is good, as well as the ICM. is this safe to say?
I'm getting odd results from the Noid lights connected to to the injector wires. I'm using the standard kit from Autozone rental. With multimeter I get 12v from each set of injector wires. The noid light does not light, however. When measuring the voltage with the noid light connected, the voltage drops to only a few millivolts. Upon cranking, there are no flashes from the noid light. There was 1 flash however, when I turned the key to on....but it's only done this once. One page I read said that noid lights may not light in all applications. Anyone have experience with my application and noid lights? or 1995 similar GM's?
So I tried to run it off a can of carb cleaner. It did fire up and run as well as could be expected from a can.
I guess this narrows it down to a fuel injector problem.
is it possible for all injectors to go out at once or will one bad one take all of them out. or is this a sign of whatever controls injector pulse is bad.
(This post was edited by bobgee on Nov 19, 2011, 5:20 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 19, 2011, 6:23 AM
Post #2 of 5
(5277 views)
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Re: 1995 Oldsmobile 88 3.8L no start no codes
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'95 GMs may not pull codes without some dealer help as OBDI+II could be complicating readings on that specific year.
Two engine styles available, I code or K code but probably not relevant. It has a cam sensor too on the maybe list of why a noid light won't blink for you hence no fuel delivery,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 19, 2011, 7:29 AM
Post #3 of 5
(5268 views)
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Re: 1995 Oldsmobile 88 3.8L no start no codes
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Check all your fuses first and then start testing for a failed ECM by verifying all the power and ground inputs to it.
Does the check engine light come on for bulb check when the key is first turned on?
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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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bobgee
Novice
Nov 19, 2011, 7:33 AM
Post #4 of 5
(5262 views)
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Re: 1995 Oldsmobile 88 3.8L no start no codes
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thanks for replying.
any tests to verify cam sensor?
check engine light does come on.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 19, 2011, 7:46 AM
Post #5 of 5
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Re: 1995 Oldsmobile 88 3.8L no start no codes
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More than likely the PCM is getting power and some type of ground or else the fuel pump wouldn't come on when the ignition is turned on. Examine your grounds at the transmission bellhousing bolts and make sure they are clean and tight.
Seeing the one pulse when the key was turned on is telling you that the driver is functional, but either isn't being controlled correctly by the PCM's logic, the PCM is in a false clear flood mode, or the PCM isn't receiving the cam or spark reference signals from the ignition control module (ICM). What some people don't understand is that even with the PCM unplugged the ICM will produce sparks and the engine will run on spray.
Your next venture is to get codes read in the PCM and to check for cam and spark reference signal patterns to the PCM using an oscilloscope.
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 Nov 19, 2011, 7:48 AM)
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