Well, today on my way home from work, my car made one hell of a popping noise. Was not beating on it, no cel or codes stored. Ran like complete crap the whole way home. Seemed like it was dumping a good amout of fuel out the exhaust. Made it back home and shut the car off. Started it up, rpm's consistantly flucuate between 1700 and 2500. Current mods are gms1, zzp catless dp, and full 3in exhaust.


thank you!!

 

exhaust leak? Did it sound like it was farting out near the engine?

 

not really, rpms were just bouncing up and down. and when comming to a stop it would just bog down kinda. lower than 1000rpms and just run like complete crap. the map and maf sensors were replaced before. have a video on my iphone, but no clue how the heck to get it on here lol

 

put it on youtube, an copy& paste the link..

 

0 boost?Any oil leaks anywhere?

 

Damnit - YouTube

when it would some what idle. vaccum was around 10 in hg.no fluid leaks

 

it can boost. but 10-15psi

 

p0507- idle air control system revolutions per minute higher than expected.

 

Poop - YouTube

 

Check for vac/ boost leaks?

 

Check that intercooler for a chunk missing!

 

Lol thank god I live a mile away from work, I'll drive it in tomorrow and put her up on the lift and see what I find, could a busted inter cooler really make it run that bad?

 

lol scoped mp5? great username lol love it! i use them at work. my favourite

 

Could not find any cracks

 

I would have said check the end tanks on the intercooler as stated before. However a crack in the intercooler shouldnt really make idle fluctuate. I have driven 10 miles with a popped coupling without issue.

I cant see your videos but the information you have posted thus far is not enough to diagnose with.

 

Are you running E85 or something??? If you are and you have not upgraded your injector seals - then chances are the seals went bad and that's the "Popping" sound your hearing.

 

What mods are done to it?
Any mods recently installed?

Stock intake? Maybe the breather line connection broke?

Definitely sounds like a leak to me... somewhere!

 

Also P0507
desired rpm - actual rpm < -200 rpm intake air temp > -11.3 ° C or 50 sec with: 4 sec
or vehicle at idle cumulative continuous
fuel cut off due to overspeed > 3 count altitude factor ( sea level = 1.0 ) > 0.594 factor or 50 sec
during this idle time after engine start > 3.84 sec
evap purge (high HC conc.) FALSE cumulative
cold start idle speed control FALSE
intrusive evap test not active
intrusive secondary air test (=not applicab not active
error: throttle position not set
error: vehicle speed not set
error: coolant temperature not set
error: intake air temperature not set
error: evap system not set
error: evap purge valve not set

Double check your Evap Purge valve on the intake manifold.

 

I'll check out the evap purge valve, not running e85. Put some seafoam through, holy smoke lol

 

Any updates on this, mine is doing this now........ same thing on the idle up and down until it dies, dumping a lot of fuel out the back if I try to drive it.

 

Looks like your car is an LSJ and OP's car is an LNF. Maybe he'll chime in and it is the same question ?????