KAT problems all the sudden

[aaronscomp]

Ok i have a t25, sidemount, stock inj, 8:1 FMU, on 7 pounds its ran good for about a month or 2 now then i heat wraped the headers cause the brake line keps craking ever since then it runs like crap if i floor it , it just sits there and sputters at about 1 grand it sounds like crap now it wont even stay running it starts up then dyes withing secondnds any and all advice would be great

[24DSXY1]

Check the spark plugs first. My car had the same symptoms and it was just from a bad spark plug on the #1 cylinder. I put in some cheap a** $2.50 plugs and voila. The weird thing is the plug that was bad was a denso iridium and it didn't look broken or dirtier then the other 3 I took out. I think I'll stick to the stock NGK platinums from now on.

[aaronscomp]

ya ill try that tommarow i got the 2.50 ngks in there right now they seemed like they were working mabe not

[aaronscomp]

how likely is it that it could be the fuel pump craping out i put new plugs in it and it does the samething

[480sx]

Car smoking? CEL on?

[aaronscomp]

no its not smoking. I take that back it smokes a little after a while though smells like fuel really badly i do beliave its running very rich but y all the sudden
Modified by aaronscomp at 11:23 PM 5/27/2009

[1mansho]

maybe you got a injector leak? Or a boost leak?

[aaronscomp]

ya i dont think its an injecter leak ill recheck for boost leaks today

[480sx]

Alright well, you said this started after you heat wrapped the headers.. You wrapped them while the manifold was on the car right? If so, check your CAS/Distributor wiring, all the wiring in that corner. Check your O2 sensor wiring and plug, even though i dont think it would make it run that bad but idk.

[aaronscomp]

ya i cheked those wires I dont think its any of that if an fmu goes bad will it do that or anything like that. Also wat about a bad O2 sensor well thanks for all the help so far

[aaronscomp]

alright i got a chance to work on it finally i think its the maf it has 12v going to it but when i unplug it the car seems to idle and run fine, it revs up fine all the way to 2.5 or what ever it is

[1mansho]

clean your maf first, than replace the maf cause it seems like its going bad. This of course your car runs fine without it.

[aaronscomp]

i replaced the maf still the same thing is happneing

[NateDogg]

Does your fuel pump turn on when you turn the key to 'ON'? If so, your ECU may be in safe mode...pull the codes off of it and go from there.

Did you disconnect any ground straps when you did the header wrapping?

What is the voltage off the maf when you turn the key to 'ON?' It should be .8-1.2V.

[aaronscomp]

they fuel pump comes on and everything no wires were removed at all i just stick the votemeter in the pigtail of the maf correct

[nuts510]

since the car only cuts up when when you're building boost you really need to look for a leak remove your airflow meter and below air into your system like when it's boosting it really sounds like you just have a leak

[aaronscomp]

well i did a compression test on it and 3 cylinders are at 120 and the other one is at 40 so idk

[1mansho]

you just blew your ringlands. time for a rebuild... im assuming you ran no timing retard and with not so great tune. Wha you should have done to ensure proper fueling is get bigger injectors at least 370 and ditch the fmu. Those are known to be the culprit of blown ka's

[carheadman]

my money is on boost leak, check all your couplers

[1mansho]

lol boost leak with a 40 psi compression in the one of the cylinders is definately a blown ringland. lowest is 151 psi and a difference between cylinders of 14psi.

[aaronscomp]

well i just slapped another one in there and im going to run it na for a bit. ill rebuild the other motor and mabe tune it on something else cause it only had about 66k original miles