Well all of the sudden the Z is acting crazy. Not sure what the cause is but need it fixed ASAP. Any and all help is appreciated. Car is a 99 Z28 A4 Car. Pretty heavily modded. The problem started about 2 days ago. When cranking the car it takes about 4 tries to get her to crank, Eventually she does start but takes time to build up to 900 rpms. While driving the car...if a give it alittle gas she does not respond. If I give her alot of gas she hesitates then sputters. No power what so ever. If at idle or parked and I turn on the AC the idle goes down to around 400rpms. Then oil pressure goes to around 18 and she may or may not stall. I have exhausted every idea I can think of. Replaced the Fuel pump, fuel filter, spark plugs, wires, checked all rockers and springs. I am lost now. Any suggestions???????

 

Possible bent pushrod(s)???
Just a guess.

 

I thought of that.......I have the Comp Chromoly ones and they are still straight. but thanks for the idea.

 

fuel pump regulator?

 

Can i just replace the regulator or is it part of the rail assembly?

 

yep you sure can. I suggested the FPR b/c sounds like similar symptoms my friend had, fuel pump reg. almost cured it. He had to do some work on his MAF sensors too but it was mostly his fuel.

Now on my 98 z the FPR is incredibly easy to get to and use a pair of pliers to get the retaining ring off. On my buddies car it was all the way in the back by the fire wall.

I am not sure where the 99s are located if its different or not. But you can pick up a new one for around 50 bucks at an auto store. good luck and make sure you know what you are doing before you spend $$

 

Update!!!!!!!!!!! I have fixed all issues and she is purring like a kitten ( actually a lion But) Come to find out that One of the harnesses at the fuel pump was unplugged! Guess she chopps alittle too much And I had to replace the engine coolant temp sensor too. She was going crazy with voltage Thanks so much for all your help .