Fuel Injectors

[ZR-1Mike]

Thanks guys, this helps starting me in the right direction. The problem started with a slight hesitation when I'd accelerate then the engine would recover and run great. Last Saturday I took the car out for about a 60 mile run and left it parked for a couple of hours and when I pulled back out on the road I pushed it to WOT with the power key on and I thought the engine was going to drop out of it. No power with an extremely rough output. It ran fine once I got out of WOT but put the power back into it and there it went again. In valet mode it pulled to redline in WOT just fine. I thought it might be flooding out the plugs but I pulled them and they look like they've been starved-burned white like it might be running too lean though the fuel pressure shows a little higher than it's called for. So that's where it's at right now. On with the adventure!!

[DRM500RUBYZR-1]

Might want to first check that the secondary fuel pump is working up to par.
Marty

[Paul Workman]

Originally Posted by DRM500RUBYZR-1

Might want to first check that the secondary fuel pump is working up to par.
Marty

I was going to say that too.

Mike: Couple things to check: Dynamic fuel pressure, and measure the current draw for both pumps (covered in Dynomites "sticky" section.

Pictured: Measuring actual fuel pressure while driving normally and at WOT. (FYI, fuel pressure at WOT should be ~54 or 55± a pound. Current draw should be between 8 to 10 amperes [with ignition switch OFF, and both the primary and secondary fuses installed])

.

[Ccmano]

Originally Posted by Paul Workman

I was going to say that too.

Mike: Couple things to check: Dynamic fuel pressure, and measure the current draw for both pumps (covered in Dynomites "sticky" section.

Pictured: Measuring actual fuel pressure while driving normally and at WOT. (FYI, fuel pressure at WOT should be ~54 or 55± a pound. Current draw should be between 8 to 10 amperes [with ignition switch OFF, and both the primary and secondary fuses installed])

.

I'd bet money, this is the problem.
H

[XfireZ51]

And u don't have any codes?

[ZR-1Mike]

No, no codes though I had a SYS warning appear at the end of June but when I restarted the car the warning was gone and never reappeared. That's the only thing out of the ordinary to have happened this year....

[XfireZ51]

Originally Posted by ZR-1Mike

No, no codes though I had a SYS warning appear at the end of June but when I restarted the car the warning was gone and never reappeared. That's the only thing out of the ordinary to have happened this year....

Any chance u noticed an SES light flickering on at the time the motor started missing etc, then went off once u backed off throttle?