LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Car bogs, stumbles, misses, but only when hot.

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Old 06-01-2005, 04:37 PM
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Re: Car bogs, stumbles, misses, but only when hot.

Originally Posted by moparman
I'd look at the coil and ignition module.
Ignition module is the same thing as the ICM right? Its right above the coil... right?
How much is this part?
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Old 06-01-2005, 05:15 PM
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Re: Car bogs, stumbles, misses, but only when hot.

Originally Posted by Black1995Z
Ignition module is the same thing as the ICM right? Its right above the coil... right?
How much is this part?
Yup thats right. I think its like 70-80 bucks.

Anyway I just replaced my coil and it ran aweosme for like 20 mins then sucky again, like usual . Plugs and wires next, then icm, then suicide.
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Old 06-01-2005, 05:17 PM
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Re: Car bogs, stumbles, misses, but only when hot.

I'm at the suicide stage..

Last edited by Black1995Z; 06-01-2005 at 05:26 PM.
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Old 06-01-2005, 06:25 PM
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Re: Car bogs, stumbles, misses, but only when hot.

Originally Posted by MRBoss429x
Yup thats right. I think its like 70-80 bucks.

Anyway I just replaced my coil and it ran aweosme for like 20 mins then sucky again, like usual . Plugs and wires next, then icm, then suicide.
Didn't you have the old coil tested?

BTW, on Autozone's site you can look up parts and prices.
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Old 06-02-2005, 02:20 AM
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Re: Car bogs, stumbles, misses, but only when hot.

i suggest the plugs...my car was having the same problme where it was hesitating and boggin and all ****ed uo looked arounf there were some tears in the spark plug wires and # 5 plug was burned completly throuhg....fixed em up ran great.....fix the wires 1st...just my .02
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Old 06-02-2005, 07:49 AM
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Re: Car bogs, stumbles, misses, but only when hot.

Do you know your fuel pressure yet? Rule it out before you go spending all this money.
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Old 06-02-2005, 11:44 PM
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Re: Car bogs, stumbles, misses, but only when hot.

I changed the plugs/wires again today along with fuel injectors and MSD6A box... all the plugs on the passenger side were BLACK(carbon) and the drivers side were nice and tan. The passenger side wires seemed to be a great shape too. ideas??
Well before I could fire it up I broke the schrader valve when putting my nitrous fuel line on... ugh! I'll let you know if it helped any when the jb weld cures, I hope it works.
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Old 06-03-2005, 12:11 AM
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Re: Car bogs, stumbles, misses, but only when hot.

im having this same problem, does it happen to you guys with like 1/4 of the troddle? Cuz if i WOT it it wont bogg as bad and takes off. I have a pretty beat up intake elbow, so im starting there, fuel pressure is fine. Next i guess ill try the wires. I put in new plugs prob 2-3 months ago. Just the dang wires are a PITA to do.

A missed up intake elbow, from what ive heard, is something that need to be replaced regardless. Supposedly it can cause pretty random problems?
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Old 06-03-2005, 12:13 AM
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Re: Car bogs, stumbles, misses, but only when hot.

Mine cuts in and out throught the entire RPM range. Yeah, Ive heard if your elbow has punctures it can make wierd **** happen.
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Old 06-03-2005, 04:17 PM
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Re: Car bogs, stumbles, misses, but only when hot.

Your passenger side 02 sensor is bad i had the same exact problem. Miss and everything, went to change the plugs one side was black the other side normal. Changed the 02 on the black side and BAM problem gone.
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Old 06-03-2005, 05:52 PM
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Re: Car bogs, stumbles, misses, but only when hot.

I've had similar problems in the past with my 93. My optispark has gone out twice and both times it did what you are explaining. Drove fine for about 20 minutes or so, or until warmed up then started missing and cutting out. New opti fixed it both times. I have also had the ignition module go out twice as well and I can tell you both times the car ran fine then backfired and died and never restarted. Replaced the module and fired right up with no problems.
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Old 06-03-2005, 06:29 PM
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Re: Car bogs, stumbles, misses, but only when hot.

Originally Posted by 84 monte SS
Your passenger side 02 sensor is bad i had the same exact problem. Miss and everything, went to change the plugs one side was black the other side normal. Changed the 02 on the black side and BAM problem gone.
Wouldnt that throw a code?
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Old 06-03-2005, 06:34 PM
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Re: Car bogs, stumbles, misses, but only when hot.

This happ to me also. The Donkey Kong was torn!!! The 2nd torn one in about 3 months. So I decided to get the polished one and it fixed my stumble!!!!!
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Old 06-03-2005, 06:56 PM
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Re: Car bogs, stumbles, misses, but only when hot.

i had the same problem. you should def. check your fuel pressure because my car was misfiring and was running like it had dead cylinders in it and it turned out to be that my fuel pressure regulator went. after that fix and new wires my car is now once again running like a champ . Def. check out your fuel pressure, and hope you dont have the same problem i had.
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Old 06-03-2005, 09:34 PM
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Re: Car bogs, stumbles, misses, but only when hot.

No it wont throw a code. If fuel pressure was a problem then all the plugs would look the same. The side with all the black plugs is getting a bad reading from the 02 causing it to dump fuel and foul the plugs. If you dont feel like wasting money, clean the plugs and switch the 02's. Left one to right and right to left. Ill bet that the other side ends up fouled.
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