Alright nissan experts,
I have a blacktop sr20det that I've had in my car for around 2 months, and the car has had a miss the whole time - First everybody told to switch the plugs, which I did, and the miss just got much worse! Then, I was told to just have a new wiring harness made, which I did - Durden perfab. Now the only things left would be coilpacks and injectors. When the a/c comp turns on, the motor runs fine w/ no miss. U turn it off, and the miss comes back! Is there anyways to test coilpacks? I mean, obviously switch them out one @ a time - but I don't have spare coilpacks laying around. I think if it were an injector it would miss all the time, right? Anyways - any help out there, or anybody wanna help me out - would be great, thanks
matt

 

Could be anything, but the change with the plugs is a clue. What are they gapped to?

How does the car run otherwise?

 

are you running too rich or too lean?

 

Well..... I dont have an air/fuel guage, other than that miss the car seems to pull hard, and with out any serious bogging.

 

now that sounds like a leaky injector or small vacuum leak.

 

yah a vacuum leak could cause enuf unmetered air to cause a lean condition at lower airflow rates i.e. idle

 

That would be the reason it goes nuts when I start it up, It barely runs, jumping around in the rpms til the car warms up - then its okay. The guy who did the swap said its because ive got an open air bov, but the bov was brand new and its closed during no boost.....so i dont see that causing anything....any other places i could have a vacuum leak? - blake....if you can fix my car ill throw ya fifty, what ya say?

 

i dont really have time this week bro. Try taking some girl you like to the store, buy some magnum codoms and put 1 over the bov and see if it runs betetr (out of boost of coarse)

 

change the fuel filter out

 

wtf fuel filter? The fuel pressure is already down to about 32psi at idle. If you had a fuel flow restriction under those conditions, you wouldn't be able to make it through the parking lot without detonating.

*edit* wrong fuel pressure. Can't subtract inmg from psi!