Thread: Problem with gtp

Hi, i have a problem with my grand prix and was wondering if someone could help me cause i'm out of ideas.

I'm running L36 with L67 top swap.
I have a 3.4 setup that's included :
3.4 pulley with shorter strap
180 drilled stat
2 degress colder plugs
4" cold air intake
ubent delete
and a complete tune by computer by DHP
i'm bossting about 15-16lbs
all done new last summer i made about 3000 km with it and
before winter it was running like new.

i had not started the engine since decembre,and today decide to crank it up. 10 minutes after start at idle,no rev, the light TEMP began to flash and after that she stay's open.

i checked my temperature and she didn't go up at anytime,engine was running great. i'm worried about that light. Oh and one time the engine start's to shake like if it had a misfire. really don't understand what is wrong,someone have ideas?

So you are running a 3.4 on a high comp block with no supporting mods?
Check the plugs see what they all look like and post pics of them. Is there coolant in it?

i was thinking that maybe it's too cold outside at this time cause the setup is set to run cold in summer..?

I loled, It took headers and a intercooler to run a 3.4 on mine. Oh and larger injectors are a good idea. Sounds like a Chunked piston. If I had to guess

on a 3.25 headers and injectors i understand..but on 3.4 ... mm

No you dont understand. My tune is off a bit and I knock on a high comp block with a cam twice the size of yours with a 3.4. Read the safelymodding your 3800 thread again.

Originally Posted by Dunes2006

on a 3.25 headers and injectors i understand..but on 3.4 ... mm

You need more then headers for a 3.25 on a High compression block..... Thats like running a 2.9 on a gtp. And on a 3.4 pulley With a AFR of 11.9 I was hitting 109 percent injector duty cycle. Pull out the plugs, See if any are smashed

but when it was tune i had zero knock.. and it ran like a new engine for the last 3000km .. that's what bugs in my head for the moment

I seriously doubt that. or you had 10WOT timing

what's 10wot?

10 WOT Ignition timming. Or you had a AFR in the 9's. Eitherway a properly tuned GT block isnt going to run a 3.4 pulley with the little supporting mods you had

sorry but i'm not used to that term "WOT"

Wide open throttle. Pedal to the metal

ok then..if i'm correct with what i understand..my bloc will blown?

Yes, You need to pulley up. Check your plugs to see what the damage is if there is any

ok so i have to put a 3.5 pulley?
i'm tired of all that,i'm thinking about demod all that and sell my car.

3.6 or 3.8 is what you need.

and i will have to make a tune with dhp again?

I doubt it, You probobly just have a DHP 1.0 tune. You will be fine

i'll begin checking all the plugs and i'll see what appens next.
thx