my 98 formula had a problem making any power at WOT. i thought it may have been a spark issue, replaced the plugs and wires no difference
put an ls6 intake manifold and new gaskets thinking a vacuum leak, didnt fix it

after the pcm was reset the car wont respond to throttle. when you give it any gas at all it misses and acts like the throttle isnt being pressed. you can get it up to about 3k rpms driving around with very lighty throttle and it back fires like crazy when you let off the throttle

got new o2 sensors and no change
new throttle position sensor no change
new maf no change
new fuel filter no change

the car doesnt have any check engine lights at all which is odd because i deleted the egr when i did an intake swap so it should immediately be triggering a code for EGR. doesnt make any knocks or pings except for an exhaust rattle from the headers. no exhaust leaks or anything either, checked for vacuum leaks again and still nothing.

can anyone with hptuners come assist me in diagnosing the problem? right now the car isnt very driveable and barely makes it around my neighborhood. id would be willing to pay you for your travel if it helps. its not my daily driver but im at my wits end with this car.

it was originally an m6 car but the previous owner put a 99 ls1 in it with 853 heads however its still running off a 98 a4 computer and harness

Thanks in advance

 

Id hit up Jessie/Dirty30

 

Ok seriously what the ****. the temperature wasnt rising when the car warmed up so I unplugged the coolant temperature sensor, went to start the car and it started instantly just blew a whole bunch of smoke out of the tail pipe and now it runs fine it just won't rev past 3k rpms.

All this for a freaking coolant sensor what the heck

And yes Jesse is the man I just didn't want to make him drive all the way from arlington

 

ask Jesse if he is coming out to the best buy meet at firewheel tomorrow night (tuesday), he shows up out there every now and then.

 

i think i have the issue resolved. unplugged the coolant temperature sensor in the head because it wasnt reading right and all of the issues with starting the car, giving it throttle, vanished.

the only issue its having now is that it wont rev past 3 grand which i think is the computer limiting the revs because it cant read the temperature (needle on the dash reads below 0 now)

think i may need to take it to him anyways to have a crank re learn done. sounds like thats whats going on with the computer limiting the revs at 3000. probably because the motor and the pcm are not mated to eachother

 

u other several other issues that need to be looked at besides the ect sensor.

 

I thought the car wouldn't run without a coolant sensor.. That might be your issue then.

 

Not sure. I broke the sensor on one of my other cars and it just made the car run in dummy mode. Either way I need to have the computer looked at and see what's going on

 

if the coolant sensor isnt reading right it will cause all kinds of issues i had the same prob a few months ago

 

I've read it can cause the crazy symptoms I was having. Just have to wait a few days for the dealer to get in the 3 pin sensor for the 98

 

if the coolant sensor is broken or unplugged it will read at -40 degrees and run rich adding too much fuel, but i don't think that's all your problem, seems like a bunch of different things

 

Jesse AKA Dirty30 has HP Tuners

 

i checked the codes and its throwing 8 codes which is what will tell that the coolant sensor isnt working right

and i believe a secondary problem is a bad maf, used one from my z28 and cleared a few issues up so the reman i got from autozone was bad.

third i believe is a crank relearn is needed on the ecu. since its not the factory computer after a hard reset it needs to be re calibrated

however this is all information i have research using the search button. BTW the ls1tech mobile site is by far the best website for using search function and browsing

 

It was the fuel pump. Everything's good now