Question about 1989 Dodge Dynasty

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1989 dodge dynasty. Cutting out while driving it. Then when I press the excellarator it acts like it isn't getting fuel. Then suddenly it works fine. Mechanic cleaned the throttle body and replaced the ASD relay. I took it home and drove it a couple of weeks and it did it again. Cuts out, acts like it doesn't have fuel, then wouldn't start. 5 minutes later it starts and runs fine while I drive it 10 miles to home. The mechanic got it to fail again once but doesn't know what actually failed.They can't get it to fail again. So it's a toss up between 3 options: Distributor, PCM (powertrain control module) or the connections between the PCM and the ASD relay. They are leaving it up to me to decide what to fix if anything. They suggest I continue to drive it until it fails completely rather than intermittantly. Of course they still want me to $215 for the diagnosis of NOTHING. What are your recommendations?

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  • mentortaz Apr 15, 2009

    I replaced the fuel pump 18 months ago when it was doing this same thing. Although 18 months ago it seemed to fail when I took turns or slowed down. The mechanic said they did a 'test' that showed a "wave form" that is normal. So they have ruled out the fuel pump.

  • mentortaz Apr 15, 2009

    apparently my technicians have checked all of this and they have given up. They want me to take the car back, pay them $215 for all of their extensive diagnostics and bring it back when it fails completely. I am so frustrated. I told them I was talking to techs on line and they said they talked to techs on line too. They say there is absolutely NOTHING they can check until it fails again and they don't want to keep the car. My frustration is that they want me to take the car until it fails again but they give me no assurance that we won't be doing the exact same thing at that time "chasing a ghost". They have ruled out the connection to ASD to PCM connection but still no control signal from PCM to ASD? What do you think about replacing the PCM and distributor now? The "gatekeeper" at "Stang Auto Tech" in Broomfield, Colorado 303-404-3813 said that he can't gaurantee that this will fix the problem. I am so confused.

  • mentortaz Apr 15, 2009

    What do you mean by a "top up?" A maxium fee?

  • mentortaz Apr 15, 2009

    They say that can't test anything else until it fails. They don't want to keep the car because they can't get it to fail again. They say there is nothing they can do until it fails again. It's a "catch 22".

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I had this issue last summer. it turned out to be a weak fuel pump. Or more specifically the check valve in the fuel pump. It will buck and carry on when you goose it.

Let it sit after you have run it for a while and the fuel pressure bleeds off. (it is supposed to stay up around 30PSI). When this happens, because of the low pressure and the heat in the engine compartment the fuel will boil in the fuel rail causing a vapor lock. The engine may start after spinning a long while, but will want to cut out if you touch the accelerator. Have your mechanic put a fuel pressure guage on it. it should be up there, like I say, around 30PSI or better when the engine is running. It should hold that when it is shut off. If it bleeds down right away, replace the fuel pump. Took me a long time to figure out what was happeneing on mine.

Posted on Apr 15, 2009

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I had a 98 dodge caravan with a 3.0 liter with the same problem I replaced the fuel pump and it ran ok for about a day then it started doing the same thing. we replaced the fuel pump 2 more times before we got a good fuel pump. apparently new fuel pumps aren't always dependable.

Posted on May 07, 2010

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It could be a fuel pump problem or filter. When the car doesn't start (or dies) you need to check to see if it is getting spark and fuel. One will be missing.

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Posted on Apr 16, 2009

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Test voltage to the injectors, Injectors get constant voltage from PCM , if the PCM is faulty or if there is a bad connector somewhere, it can shut down the engine cutting power to injector.

Test also wiring from injection to PCM and ignition coils.

Posted on Apr 15, 2009

  • Ginko
    Ginko Apr 15, 2009

    One thing is sure, what the mechanics said is true "They say there is absolutely NOTHING they can check until it fails again". They will have to connect the car to diagnostic tools to screen power to injectors, and to check fuel pressure diagram in the moment it fails. The problem looks quite unusual, and it may take a man working at your car for hours, insist to have the $215 charge used toward a full repair with a reasonable top up, they already did half of the job.
    They can rule out the ASD relay, and connection to PCM, but they should read injectors waveforms and also pump when the engine fails.


  • Ginko
    Ginko Apr 15, 2009

    You said that you are paying $215 for jobs already done, at this point ask them to finish the job and complete testing, if they have not even found if this was distribution, injection or fuel circulation problem, that means that they have not tested the engine when this is failing, or they have not tested properly. Tell them to finish the job and to fix the problem.

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