Re: What is the expceted Fuel Rail Pressure when driving
 

Jim if you decide that you want to try a set of new pumps I have two in the box. I could send them to you & you could see what if anything happens.

Just saying if it gets to the point that there are no definitive sign posts. The spares I have are Delphi pumps from that batch of fuel tank units they were selling awhile back.

:cheers:
Tom

Re: What is the expceted Fuel Rail Pressure when driving
 

Thanks very much, Marc!:notworthy

Re: What is the expceted Fuel Rail Pressure when driving
 

Ted,

I'm pretty sure I got it at AutoZone. I'll be by there tomorrow anyway, and I'll see if I can find one there. I'll let you know.

P.

Re: What is the expceted Fuel Rail Pressure when driving
 

Hi Ted,

My fuel pressure rig looks similar to Paul's. I bought the basic fuel pressure pressure tester at AdvanceAuto and then cut the hose and added a couple of feet of fuel line. It took a couple of barb fittings and hose clamps.

The AdvanceAuto fuel pressure tester is nice because it has a pressure release valve built in at the gauge end so that you can relieve the fuel pressure before you unscrew the shrader fitting from the fuel rail. This greatly reduces the fuel sprayed on the back of the alternator. :-D

Jim

Re: What is the expceted Fuel Rail Pressure when driving
 

:saluting:

Thanks for the generous offer Tom. I have a couple of spares on hand. The only reason I haven't just put them in is that I am curious to see if I can diagnose the problem instead of just doing wholesale part swapping. But if it comes down to that, I am ready to go. ;)

I am very sorry to hear that your Z got rear-ended. I know it must have been a very sickening feeling. I am sure you will get it fixed up good as new.

Jim

Re: What is the expceted Fuel Rail Pressure when driving
 

Trouble shooting update. Engine is running rough at all speeds and indicates lean on the left bank.

I replaced the left bank O2 sensor. The problem did not change.

Did some WOT runs with a fuel gauge in stalled. Fuel pressure tracked properly with manifold vacuum and at WOT fuel pressure was 51 psi.

I think that I have ruled out a fuel filter or fuel pump problem.

I still get DTC 55, Fuel Lean, on every WOT run.

At WOT, Left Bank O2 read 4 mvolt (and averaged < 200 mvolt) on a Tech 1A.

My next step is to check the plugs and plug wires and coil secondary circuit. Then I plan to pull the plenum and check the coils and replace the injectors with a low miles OE 1993 set that I have.

Any other thoughts or suggestions?

Thanks,

Jim

Re: What is the expceted Fuel Rail Pressure when driving
 

dont know if this is it but i had one side of a coil go out. and it was rough at idle and kinda smoothed out when i hot on it . gerry was the one that pointed me in that direction (thanx jerry(

Re: What is the expceted Fuel Rail Pressure when driving
 

Was this problem ever ironed out? I was experiencing something similar. It was a fuel pump that would fail at WOT. How I found it was that it got progressively worse then finally failed once shortly after start-up.

I just received two new fuel pumps from Rockauto.com.
They were $36 ea.
Brands were Performance and part # P-240 KC.
They work fine. Pressure is back up to 55psi at start then
at 42psi at idle and
the pressure holds at 35psi when ignition turned off so
the check valve is holding.
The worn ones only managed 38psi at start up and dropped to 0
as soon as the ignition was turned off.
I think this problem is solved.
Time for a test drive. 70degs, sunny and no smog.
yippie


PS I always call in my CC when ordering from Rockauto.
Two bad experiences when entering CC # online.

Re: What is the expceted Fuel Rail Pressure when driving
 

Scott, I do believe that this turned out the be a pinched wire on one of the primary injectors. Jim figured that it got pinched upon a plenum re-install.

:cheers:
Tom

Re: What is the expceted Fuel Rail Pressure when driving
 

My problem turned out to be injector related, not the fuel system. One problem that complicated the trouble shooting was that the fuel pressure tester I was using has a problem with the fitted that attaches to the schrader valve on the fuel rail. When the fitting was screwed on tight, the pressure gauge would not display fuel pressure. Very annoying.

Jim