Developed a miss...... - ZR-1 Net Registry Forums

32valvZ · 11-09-2008

Only seems to happen at part throttle. If I'm coasting or I'm between gears then ease into the throttle it misses pretty badly. Its almost as if one or more cylinders just stops firing..... then suddenly, it all catches up and its fine until the next time it feels like doing it. Its pretty random, but getting more frequent. Having trouble determining weather its fuel or ignition related.

Heres what Ive done so far.

Pulled all the plugs... they look like new.

Checked fuel psi.... its 40 KOEO & 40 running, doesnt ever seem to bleed down past 38 psi

Checked for codes..... found a code 13...... checked the o2 wires, the o2 extension harness, and pulled th o2 on that side. It all looked ok to me, nothing unusual.

Pulled the air horn and looked into the throttle body to observe the butterlies..... all 3 looked like they were functioning properly, and the back sides were clean still from when I cleaned them during the plenum pull.

NOTE** all the injectors, coils, plugs and wires are under a year old, as well as the fuel filter.

Any ideas on where to go next?

11-09-2008	#1
32valvZ Join Date: Nov 2007 Location: Sunshine State Posts: 1,071	Developed a miss...... Only seems to happen at part throttle. If I'm coasting or I'm between gears then ease into the throttle it misses pretty badly. Its almost as if one or more cylinders just stops firing..... then suddenly, it all catches up and its fine until the next time it feels like doing it. Its pretty random, but getting more frequent. Having trouble determining weather its fuel or ignition related. Heres what Ive done so far. Pulled all the plugs... they look like new. Checked fuel psi.... its 40 KOEO & 40 running, doesnt ever seem to bleed down past 38 psi Checked for codes..... found a code 13...... checked the o2 wires, the o2 extension harness, and pulled th o2 on that side. It all looked ok to me, nothing unusual. Pulled the air horn and looked into the throttle body to observe the butterlies..... all 3 looked like they were functioning properly, and the back sides were clean still from when I cleaned them during the plenum pull. NOTE** all the injectors, coils, plugs and wires are under a year old, as well as the fuel filter. Any ideas on where to go next? __________________ [B]1990 #2815[/B] [COLOR="Red"][B]Red/Red[/B][/COLOR] Ported Plenum & IH (by Pete) Haibeck Chip Rebuilt FPR (by Phil) FIC Injectors Watson LT Headers 3" Stainless Works exhaust Lingenfelter Open Air Lid Bill B Built Transmission Shifter & C Beam Plates [FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT] [FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT] [B]SOLD[/B]