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Hot re-start problem

 
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ken729
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PostPosted: Tue Feb 02, 2010 9:25 am    Post subject:  Hot re-start problem Reply with quote

Does anyone have an idea what may be causing this? Its in a 2000 LS with 135K miles. Thanks.

Vehicle has intermittent hot re-start problem as follows:

Car starts and immediately the idle stumbles ( rpm jumps up and down and then levels out ).

Car starts and dies immediately – it will restart after waiting about 10 minutes.

There is no “check engine “ light on. (It does work). Runs perfecly on the road otherwise
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wanderson75
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PostPosted: Tue Feb 02, 2010 10:33 am    Post subject:   Reply with quote

Pull the plug to the MAF sensor and fire it up. See if the issue goes away.

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schmidty
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PostPosted: Tue Feb 02, 2010 10:52 am    Post subject:   Reply with quote

I had a similar issue and it ended up being my fuel pressure regulator
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ken729
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PostPosted: Tue Feb 02, 2010 10:59 am    Post subject:   Reply with quote

I had the MAF replaced 3 weeks ago due to a cold no-start that flooded the engine. That seems to be fixed and the cold starts are much better. The MAF was found to be out of spec by a local shop. The occasional hot restart stumble issue was going on before the MAF was changed and seems to be unaffected by the MAF replacement.. What do you think this could be? The car runs real good otherwise,
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98ss
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PostPosted: Tue Feb 02, 2010 12:20 pm    Post subject:   Reply with quote

+1 on fuel pressure regulator
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ken729
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PostPosted: Tue Feb 02, 2010 12:26 pm    Post subject:   Reply with quote

Thanks - could FPR be the cause even if no fuel is evident in the vacuum line?
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bbengineer
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PostPosted: Tue Feb 02, 2010 12:28 pm    Post subject:   Reply with quote

I would check for a dirty/stuck IAC

Yes, the FPR can still be bad even if there is no fuel in the vac line

BBEngineer

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ken729
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PostPosted: Tue Feb 02, 2010 12:36 pm    Post subject:   Reply with quote

Ok thanks- the IAC is new so I'm pretty sure thats okay. Tthe FPR is at the of the list to check. The MAP sensor is the only other suspect I've been reading (on other forums) that has solved similiar problems. Any thoughts on that sensor? Mine is the original - never replaced it ( except for the PCV underneath).
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2001Ls
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PostPosted: Tue Feb 02, 2010 12:41 pm    Post subject:   Reply with quote

Hey Ken, I have the same thing with my car. When I stop to get gas or stop at all and kill the ignition after I have been driving for over 15-20 mins It wont crank up unless it has been sitting for a few minutes.... I mean It start but it usually just coughs on the first attempt then I let it sit for a minute and it starts.... I also am trying to fix this

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ken729
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PostPosted: Tue Feb 02, 2010 12:50 pm    Post subject:   Reply with quote

Glad to hear from you. If i ever get this thing fixed I will be happy to share the solution. As it stands now. I hope to get this fixed myself with a minimum of guess work. If that doesn't look like its going to be feasable then I'm going to have the dealer look at it.
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schmidty
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PostPosted: Tue Feb 02, 2010 1:00 pm    Post subject:   Reply with quote

My car was behaving similarly. then it got to the point that if i was coasting downhill with no strain on the motor it would stall out. i'd make that kind of a priority to look at
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ken729
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PostPosted: Tue Feb 02, 2010 1:17 pm    Post subject:   Reply with quote

Havent had that happen yet -in fact it it drives perfecly. Good gas mileage and lots of power form the 3.8. The prospect of the hot start problem 50 miles from home where its been 15 degrees at night turned in to reality yesterday - so , yes, its definetly a priority now,
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ken729
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PostPosted: Sat Feb 27, 2010 12:22 pm    Post subject:  Update Reply with quote

Here is an update on the problem which I believe may be fixed.
Since my last post, I spoke with a mechanic who tells me that my problem sounds like a vacuum leak. I did find a damaged oring on the PCV valve and the PCV itself didnt appear to be seated all the way.. For good measure I also replaced the IAT sensor ( the new one makes the OE one look like a childs toy) and the air filter. (which is real close to the incoming air horn). So far in the past 3 weeks the restart idle has been very smooth with no bouncing up and down before settling in at about 750 rpm. Incidently, the upper and lower intake manifold gaskets had been replaced with the new versions about 15k miles ago by the dealer.
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PostPosted: Sat Feb 27, 2010 1:34 pm    Post subject:   Reply with quote

I had a similar problem about 3 years ago with my Imp... Turned out my fuel pump was starting to fail... Finally one day the car would not re-start at all... Mechanic replaced the fuel pump and it's been perfect since...

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