Question about Oldsmobile 88

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I have a 1988 Olds Delta 88 Royale Brougham equipped with the "C" version 3.8L engine. It runs well but intermittently "stutters" while on the road or at a stop. The "stuttering" is similar to what I have experienced when an engine misfires, due to arcing spark plug wires, or when a fuel filter is clogged. I have already changed the spark plugs and fuel filter with no effect on the problem. The spark plug wires appear to be OK (i.e., not arcing). What is left to check? Ignition coil and/or ignition module?

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  • jwscott1972 Apr 06, 2011

    I think the solution was helpful because it is different from what the GM dealer thinks the problem is (i.e., coil or ignition module) but has been unable to pin the problem down, much less fix it. I will let you know what solution actually solves the problem. Incidentally, no fault codes have been detected by the dealer thus far after four attempts. - JWS

  • jwscott1972 Apr 06, 2011

    I think the solution was helpful because it is different from what the GM dealer thinks the problem is (i.e., coil or ignition module) but has been unable to pin the problem down, much less fix it. I will let you know what solution actually solves the problem. Incidentally, no fault codes have been detected by the dealer thus far after four attempts. - JWS

  • jwscott1972 May 26, 2011

    An update from the owner: The problem was finally diagnosed by the local GM delaer as being a faulty fuel injector in conjunction with a bad (or going bad) Engine Control Module (ECM). Both items were replaced with AC Delco parts and the Delta 88 now runs very smoothly. I did hear about the potential problem with the fuel pumps but there apparently is an easy test for a malfunctioning one. Nonetheless, thanks for your solution. - JWS

  • jwscott1972 May 26, 2011

    An update from the owner: The problem was finally diagnosed by the local GM delaer as being a faulty fuel injector in conjunction with a bad (or going bad) Engine Control Module (ECM). Both items were replaced with AC Delco parts and the Delta 88 now runs very smoothly. I did hear about the potential problem with the fuel pumps but there apparently is an easy test for a malfunctioning one. Nonetheless, thanks for your solution. - JWS

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  • Oldsmobile Master
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Sounds like a problem with the fuel pump components in the fuel tank. Especially look at the small rubber hose that connects the pump to the pickup tube for being loose and sucking air. The fuel pumps are well noted to start to fail around 40,000 miles.

About this, just need to be extremly careful as the replacement pumps usually come with new electrical connectors and must be utilized for installation on the new pumps as the old connectors tend to not fit correctly and can become loose thus causing erratic pump operation. GM has a lousy reputation on their fuel pumps as it is the gas in the tank that is used to keep the pump from overheating due to the high speed operation of the pump and I have seen numerous pumps fail when the fuel level gets below 1/8 tank of fuel.

Remember that intermittent faults are very diffcult to diagnose, but testitng one to one devices could be good results. Also, could be vacuum leak or vacuum hoses in wrong places. Scanned the ECU, some fault code stored there maybe.

Keep us updated.

Posted on Apr 06, 2011

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