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Problem car bogging after startup

Shang TI

Shang TI

New member
When i start my car cold it runns fine for maby a minute and then it bogges down and then reves up prety high for about 2 minutes and once it warms up it stops, I have a cylinder 4 missfire and i am thinking it is my lower intake, i have changed plugs wires and coils, is there anything else that it could be. My gtp is a 98 and has 196xxx miles.
 


moved and fixed you title some, best to give a slight idea in the title, people will be more helpful and less likely of passing up the post
 
So i really need help with this ive replaced the maf and put some autolite xp 606 instead of crappy champions and its still running really bad, it boggs down to like 400 rpm or lower and struggles to keep running it doesnt rev up anymore it just stays bogged down sometimes even dies. Could it be because i put headers and a 3" catless down pipe on it, it didnt start doing this untill about 4 days after it put em on tho, does it just need a good tune or what. I also replaced the injector for cylinder 4 and it is still missing out but that and not having a cat are the only codes its throwing i dont know what to do im out of ideas.
 


Exhaust/vacuum leak.

Also...if your fuel trims are screwed up...it'll make it bog. I had that issue.
 
Well ive been messin with it and im prety sure i need to replace the head gaskets because i loose coolant really fast and that would explain my cylinder 4 missfire when the motor is cold and i will most likely throw a cat back on there and see what happens. What is a good fuel pump? im prety sure that is going out too because when i get on it, it boggs first and then goes
 


I'm not seeing what year/model you have. I see gtpinsc said you needed the L67 section, so I'll assume that's what you have. Please mention year/model though.

It's quite uncommon for a head gasket issue. It's pretty uncommon for an LIM gasket to cause a notable miss on a cylinder as well. Sure the gaskets look horrible and have caused some issues, but it's not all that common.

Do you have any codes, or check engine light lit up? Please pull them and list them if you do. With the way it's running , there should be something.

Has any work been done to the car recently beyond the wires/plugs/coils?

Pull the #4 plug and take a picture. Is it wet with coolant, carboned up with gunk? What's going on in #4 is what you need to know. I have seen an ICM go bad and not fire at the correct time for the second cylinder. It's uncommon as well, but can happen.

Before you start tearing down, let's get as much info as possible to help you pinpoint the repair needed.
 
Its a 98 grand prix gtp, i pulled all the plugs and they look the same nice and new no coolant or gunk on #4. The codes that are coming up are cylinder 4 misfire which has been there for a while, long before it started acting up, and one for not having a cat, i just ordered a 02 sim so not having a cat shouldn't be a problem once i put it on. The miss is only noticeable when the motor is cold but i loose coolant really fast and i have a new radiator so head gasket is all i can think of for that issue. I did put headers on it then my radiator blew up and 2 or 3 days after replacing it it started running like crap after i start it. The intake starts sucking in air, really loudly, and it just boggs down for about 4 minutes then levels back out and is fine. I also replaced the MAF and thermostat. The car is at my friends shop right now and he said it seems like its the head gaskets which would cost $1550 to fix thats with a valve job machine the heads and block. I really dont want to pay that much if it is something else tho.
 
So i decided to just start pulling my motor apart and i found a slight problem with my intake manifold a hole where coolant had found a way out that whole spot was full of gunk and coolant and i also found coolant in cylinder #4

photo3.jpg
 
Damn I'd say so WTH is that...get a new manifold man...clean out that cylinder and change the oil after you re-install everything and fill it with coolant.
 
I thought the same thing, im just waiting on parts now hopefully ill have it running soon im tired of driving this plymoth breeze haha... slow as balls
 


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