Misfire and possible chipped piston?

BLOWN. putputput at wot isnt a good running engine.

Quote:

---

Originally Posted by Japman502

hi everyone im new here but i have a few questions i have a 99 gtp with a few small mods i recently swapped a 3.4 pulley and shortly after that i was getting KR but as the whether got colder it went away so i just put a 180 thermostat in yesterday so it would run cooler but right after i did it sputters when i go full throttle(WOT) or after it hits 4 psi i should also mention that when i did the thermostat i pulled one of the plugs to see if i should replace them but did not

---

this is simple, do a compression test. pull the plugs look at them. oh, put the stock pulley back on if its not a chipped piston. or you will chip one.

Quote:

---

Originally Posted by Japman502

Only mods are the pulley the stat after market boost gauge and flow master mufflers I runs to good to be blown

---

Tick tick BOOM!


Seriously I suggest your throw the stock 3.8 pulley back on before you find yourself replacing the motor

I have heard from this site that you can do a 3.4 pully without doing any mods and I have done a few

And the thing I find strange is it only started doing this after I put the thermostat in I'm gonna put the stok one back Monday and see if it goes away

3.4 on a stock Gen V powered 3800? Needs more than a t-stat man. No wonder you chipped pistons.

Lol I couldn't begin to tell you how many websites and forums (includind this one)say you can put a 3.4 on a stock car and like I sai I have a cold air intake and ubend delete flow master mufflers and platinum plugs with bosh wires so its not completely stock and I no I did not blow the motor it's funny that I come on here for answers where everyone is supposed to be so smart about these vehicles but the first thing people start saying is a blown motor

Quote:

---

Originally Posted by Japman502

Lol I couldn't begin to tell you how many websites and forums (includind this one)say you can put a 3.4 on a stock car and like I sai I have a cold air intake and ubend delete flow master mufflers and platinum plugs with bosh wires so its not completely stock and I no I did not blow the motor it's funny that I come on here for answers where everyone is supposed to be so smart about these vehicles but the first thing people start saying is a blown motor

---

All you've done is a CAI and a tune up.... Do more research friend. May not be completely trashed, but you've set yourself up for failure if you beat on her bad enough.

I've been researching the same basic thing, whats needed for a 3.4 pulley. I haven't seen anything about only needing a U bend delete and a CAI. Most of what I have seen has said, CAI, headers, new down pipe, a tune, a 160 T-stat and colder plugs at minimum.

Quote:

---

Originally Posted by Japman502

Lol I couldn't begin to tell you how many websites and forums (includind this one)say you can put a 3.4 on a stock car and like I sai I have a cold air intake and ubend delete flow master mufflers and platinum plugs with bosh wires so its not completely stock and I no I did not blow the motor it's funny that I come on here for answers where everyone is supposed to be so smart about these vehicles but the first thing people start saying is a blown motor

---

Not on this site. You need headers to run a 3.4

See? Lol... put the 3.8 back on.

Quote:

---

Originally Posted by Japman502

Lol I couldn't begin to tell you how many websites and forums (includind this one)say you can put a 3.4 on a stock car and like I sai I have a cold air intake and ubend delete flow master mufflers and platinum plugs with bosh wires so its not completely stock and I no I did not blow the motor it's funny that I come on here for answers where everyone is supposed to be so smart about these vehicles but the first thing people start saying is a blown motor

---

ok, you really need to read a lot more, put that damn stock pulley back on, then GET RID OF THEM PLATINUM PLUGS!!! <<<i bet 100 bucks this is why you car runs like crap right now. put iridium plugs back in. you can thank me later.


Get headers. then put the pulley back on, then have it tuned via the pcm. cause if the piston aint chipped, it will be soon.

Yea you need to do some more research you cannot just throw a 3.4 pulley on and expect good things. The mods you have aren't really mods and will not support the kind of drop. Get headers and first and foremost scan scan scan! Every car is different what works for one Joe might not work for the next.

Some websites are different when I initially did the pully I had a lot of ping but then I did the ubend delete plugs and wires and intake and it was gone I only did the thermostat becouse the summer that's hopefully coming soon but I have read that with the stat you are messing with the computers intelligence to monitor the tempiture of the vehicle and makes it run rich so in WOT its getting too much fuel and is basically flooding itself out

I have a budy who has a programmer I just have to buy the software

Quote:

---

Originally Posted by Japman502

Some websites are different when I initially did the pully I had a lot of ping but then I did the ubend delete plugs and wires and intake and it was gone I only did the thermostat becouse the summer that's hopefully coming soon but I have read that with the stat you are messing with the computers intelligence to monitor the tempiture of the vehicle and makes it run rich so in WOT its getting too much fuel and is basically flooding itself out

---

160* is way to cold, only got with 180* at the coolest, I've decided to stay with stock. I don't think that you have read to much. 160* is where the car starts detecting knock so you might be hurting yourself even more because the car wasn't hot enough to start detecting knock. Go back to stock pulley, plugs, and thermostat.

Quote:

---

Originally Posted by Japman502

I have a budy who has a programmer I just have to buy the software

---

Tuner or programmer? Just because he's a programmer gives him no place to tune a car. If you thought you had to read for modding, there's more knowledge for starting tuning.

read up son.

http://www.grandprixforums.net/start...ers-43997.html

http://www.grandprixforums.net/dhp-t...ols-51356.html


and read this one first. this is the one post YOU NEED TO READ! http://www.grandprixforums.net/safel...0-a-67580.html

Quote:

---

Originally Posted by Japman502

Lol I couldn't begin to tell you how many websites and forums (includind this one)say you can put a 3.4 on a stock car and like I sai I have a cold air intake and ubend delete flow master mufflers and platinum plugs with bosh wires so its not completely stock and I no I did not blow the motor it's funny that I come on here for answers where everyone is supposed to be so smart about these vehicles but the first thing people start saying is a blown motor

---

No one on here should have told you you can run a 3.4 on a stock motor. Some people chip pistons on stock motors stock pullies. You need to run headers or a plog dp combo. You need to get some copper core plugs 605's or 104's autolite. Also get a 180* thermostat

I have the 180 thermostat that's were the problem started everything before the tsat was perfect and I'm not sure what my buddy has but he said we could drive down the road and set the car up through the computer so I guess it's a tuner idk but thanks for the help I'm gonna put the old stat back in and if it cures the problem then I'm gonna do the 104s and when I get a lil more money try and get the headers

the t stat's not the cause,(put it back to stock 195 anyway) its the plugs your using, they are no good. change them, then pray it runs better, cause if it dont, its a piston.

get copper plugs or iridium plugs.