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3.8 Hard Start when Warm

 
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greeno
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2002 Chevrolet Impala
1995 GMC Sierra


PostPosted: Mon Sep 16, 2013 9:11 am    Post subject:  3.8 Hard Start when Warm Reply with quote

My '02 with 210k has a problem starting when the engine is warm. It starts fine in the morning, but when the engine is warm from running or the afternoon sun, I have to press the accelerator down about a 1/4 of the way to get it to start. Otherwise, it just cranks and cranks. Sometimes, it will fire once and die. I have no MIL codes other than an 02 sensor code.

Where to start? I replaced the IAC just for fun...no luck.
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chibiblacksheep
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2000 Chevrolet Monte Carlo
2007 Chevrolet Impala
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PostPosted: Wed Sep 18, 2013 4:30 pm    Post subject:   Reply with quote

Most likely it's the MAF.

Unplug the MAF sensor and try to start it next time. But don't drive around with the MAF unplugged a lot.

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Frank
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PostPosted: Wed Sep 18, 2013 9:52 pm    Post subject:   Reply with quote

Could also be a bad fuel pressure regulator. Start with the MAF. Smile

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98ss
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2011 Chevrolet Silverado


PostPosted: Sun Sep 22, 2013 7:12 pm    Post subject:   Reply with quote

Sounds like your FPR took a dive. But, if the 02 sensor is out of wack it could be throwing things off since the car is in closed loop when warm. The car negates the 02 sensor when cold (open loop).
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greeno
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2002 Chevrolet Impala
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PostPosted: Tue Sep 24, 2013 8:05 am    Post subject:   Reply with quote

Well, the MAF sensor 'unplug' did not affect starting. I'll try the Fuel Pressure Regulator next.

Thanks all for the suggestions.
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greeno
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PostPosted: Thu Sep 26, 2013 9:11 am    Post subject:   Reply with quote

Yes, it was the FPR. Runs like a champ.

The fact that the vacuum line on the FPR wasn't filling up with fuel kinda led me away from that part, but indeed that was the problem. Thanks guys.
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saliva2002
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PostPosted: Sat Nov 23, 2013 2:06 am    Post subject:   Reply with quote

mine has been doing that since i bought it used with 10k on it. The dealer told him it was normal. Since they have the automatic start (where you just turn the key and it cranks itself) they said it was a design flaw. It still does it, sometimes when its cold, but mostly when its warm. Its been 8 years and still does that. I'll turn it and it will crank 3 times and stop, usually the seconds turn will do it, sometimes 3. I'm still pushing the stock battery too, it sure loves these -10 winters Very Happy

What did the FPR cost and how much of a pain was it to install?
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Frank
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PostPosted: Sat Nov 23, 2013 7:57 am    Post subject:   Reply with quote

FPR is around $30 and it's about five minutes with a pair of snap ring pliers. It's on top of the fuel rail, and the only thing you need to worry about is bleeding off the fuel pressure first.

Pull the fuel pump relay, crank the engine, let it run until it dies, then bleed off any remaining pressure through the valve on the fuel rail first. Your dealer is full of crap. Wink

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2001Ls
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PostPosted: Sun Nov 24, 2013 4:46 pm    Post subject:   Reply with quote

FPR

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saliva2002
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PostPosted: Sat Nov 30, 2013 7:18 am    Post subject:   Reply with quote

Frank wrote:
Your dealer is full of crap. Wink


You're telling me. I needed a new fuel filter and i was getting an oil change anyway so i told them to do it. Said they couldn't get it off, and they would have to rip out the entire fuel line and replace it.... took it home, took some work but got the filter off. They also told me that i had an antifreeze leak, did a dye test, and because they couldn't find a leak, it was for sure the intake gaskets, and if they did the $800 job, they wouldn't charge me for the dye test. I called the mechanic that replaced the intake gaskets two years prior, he said bring it to him. He did a dye test and found the leak and replaced the o-ring. Needless to say i have them find the problems, not fix them.
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