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#1
01-14-2008, 09:21 PM
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97 gtp stumbles on startup
Its the darndest thing the car stumbles on startup... makes a sound like wum,wum,wum then the idle evens right out.
1997 gtp w 120k here is a list of the most recent repairs(new to old 1 1/2yr) fuel pump resistor fuel pressure reg air filter clean maf o2 sensor fuel pump/filter 02 sensor map and of course the repairs that had nthing to do with the engine, but that is another story.... i have been a fan/user of this site for years thanks for all the help! Last edited by BNaylor; 01-16-2008 at 07:20 AM. 
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#2
01-16-2008, 07:22 AM
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Re: 97,gtp stumbles on startup
Do you still have the original spark plugs and ignition wires? I didn't see them mentioned and a PCV valve.
Also, try cleaning the throttle body and IAC sensor. And welcome to AF and the Grand Prix forum.
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
01-16-2008, 12:45 PM
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Re: 97,gtp stumbles on startup
I have got new plugs and wires and was planning to start the changeout within the hour (AC Delco 41-101 iridiums)
I am also giong to take the advice above and clean up what i can I'll have to wait on the pcv valve until after the plugs/wires fun that i am about to have. thank you for your help!
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#4
01-16-2008, 09:15 PM
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Re: 97,gtp stumbles on startup
Well the stumble-on -startup is gone!
new plugs and wires did the trick Iwill monitor the situation over the weekend trip hopefully my gas mileage will come back as well thanks again for the help!
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#5
01-20-2008, 06:57 PM
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Re: 97 gtp stumbles on startup
Well the stumble is back , i think the car is mad , my wife returned from shopping and said the car was making a noise, upon investigation i did hear a suspicios noise from the pullies, i had planned on changing the belt (It looked worn) and i picked up a new one before we left, which came in pretty handy when the belt (sc belt)flew off while i was looking at it. It was the plastic idler pulley that bit it(auto zone had it in stock)
the idler pulley finished the belt off when it self destructed. when the engine was revved during investigation i discovered that the engine will only rev to 4000 then 3500 then back to 4000 then back to3500 ect. the road test it revved to redline upon WOT under load and had no lack of power or miss of any kind. What do you guys think could cause this?
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