Hard starting when warm

Asked by Tcat Oct 04, 2012 at 12:17 PM about the 2001 Pontiac Grand Prix GT

Question type: Maintenance & Repair

2001 pontiac grand prix gt, always starts good cold but sometimes when warm acts like its flooded?

4 Answers
3,265

Thomas answered 11 years ago

it might be your fuel pressure regulator has gone bad or the hose going to the MAP (manifold air pressure sensor) may be broken

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275

Will answered 11 years ago

I would check the idle air control valve (IAC).

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Guru9Q41K answered 6 years ago

Well I have a 2000 grandprix gt and it would not start after warm I change the t ps sensor idle air control map sensor low coolant sensor low oil level sensor crank sensor change them all my self did not solve problem with warm starting so I took my car put it on computer it was the ingnition control module after they told me problem went home hook it up myself problem solved starts any time now the icm is under you're coil packs and is common problem for grandprix

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