Cosmos

iTrader: (15)

Car ran great. I went over a bump today (construction) Car wants to die and idles around 400 rpm sometimes after I went over the construction bump hard. It ran like crap 3k and under. I had to hit the throotle quite a bit to keep it running.


Its a M6 H/C. It ran awesome before I hit the uneven street.

Any ideas? Im going to test the fuel pressure by this weekend.

What the hell did I bump to make my car run like crap?

SteveLS19057

any whistles? could be a vaccum line that came loose, did a reverse burnout in my 85 camaro and knocked one loose, had no breaks and had to struggle to keep it from idling too low for 3 days till i found out it was just a loose line.

Jersey Mike

iTrader: (9)

Check your battery terminals' connections first.


After that, check that all the injectors are seated properly & check fuel pressure.
If that's all fine, it could be an alternator issue.

Cosmos

iTrader: (15)

Thanks guys. Ill check those today. Ill post up once I find the problem

mattzoom

Check your maf connection I was just having some idling issues with my 3rd gen and the maf was bad but when it became unplugged it ran normal could be reversed for u lol.

NC98Z

iTrader: (1)

If you did it when you hit the speed bump then I would be checking the wires going to the O2 sensors.

2000PewterT/A

I would check all the main sensors in your before anything else, and obviously the battery connections and grounds.

LSjim

iTrader: (8)

+1 on the battery and grounds

Cosmos

iTrader: (15)

Checked the 02s, that was my first guess they are fine. Checked the battery cables, fuel lines, sensors they are fine. I did notice the vaccum port on the very back of the manifold (right by the MAP) is open. Im going to fix that and see what happens.

Wouldnt a vacuum leak cause it to idle high though?

Jersey Mike

iTrader: (9)

Correct. The car would be fighting the brakes. It'd be getting too much air, it sounds like you're not getting enough--"I had to hit the throotle quite a bit to keep it running."

Cosmos

iTrader: (15)

Well I capped the vaccum leak and it seems to run better. It idles low after it moves or is givin throttle, but I can now give it throttle and it comes right up.

I think I may have tuned my car with a vaccum leak. That would be the reason why it idled better than expected with the Trex, ported heads and upped compression over last years cam only set up

The vaccum leak is the vacuum port right next to the MAP sensor for the Heater controls. I thought I had plugged it but I guess not.

So I get to retune the car (planned on that anyone once I get a intake).

I hope my experience can help someone out in the same boat!

I also threw codes

p0102- MAF low signal. Ive had this code for 2 years. Going to check the fuse now.
p0108- MAP circuit high. THat makes total sense because the vacuum leak
p0117-Coolant temp sensor low input. Never had that before

Cosmos

iTrader: (15)

So I ran into the problem again today. When I fixed the vacuum leak, I also reset the ecu at the same time. So I basically just bought myself some time until the ECU figured out I tricked it. So I check the infamous ENG 20 AMP fuse and sure enough it is blown. Going to get a fuse tomorrow and it should fix the problem.