ericn1300

I replaced the head gaskets on my 96 3.1 and am now getting a solid flashing light with a 303 misfire code and a pending p1200. I can't find much info on the p1200 other than "P1200 - Injector Control Circuit" Any idea of what to look for or where to start on that one?

tblake

Yes, check the injector electrical connector at number 3 cylinder. Might have to pull the upper intake again, but you should be ok to reuse the gaskets. I bet you'll find your problem is either unplugged injector or wiring to it got pinched off. Common mistake.

__________________
2000 Pontiac Grand Prix GTP
(3.4" Pulley, DHP 1.5 Powertuned PCM, ZZP 2.5" High Flow Downpipe, MMS Ported and Polished Lower Intake Manifold, ZZP Stage 1 Ported Throttle Body, 180° Thermostat, NGK Iridium TR6IX)

1997 Chevrolet Silverado K1500 4x4 350
(soon to come,true dual exhaust, roll-up access tonneau cover, light bar)



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ericn1300

Yep, thats what I'm thinking too. checked the plug for fouling, clean. Checked for spark, good. Ran the emmision sniffer up the tail and under the engine compartment, no raw fuel or emission codes.

Guess im going to pull off the top tomorrow unless anybody has any other ideas.

jcb1100

You guys are good: following an UIM and LIM gasket job, I got the flashing SES light, with codes P0306 (cylinder 6 misfire) and P1200. After checking here, I found the #6 fuel injector wire unplugged. Duh. Ran fine after that...

tblake

It happens and is a simple fix. I'm 99.99% sure that was the issue for ericn too, although he has not responded back to let us know the outcome.

__________________
2000 Pontiac Grand Prix GTP
(3.4" Pulley, DHP 1.5 Powertuned PCM, ZZP 2.5" High Flow Downpipe, MMS Ported and Polished Lower Intake Manifold, ZZP Stage 1 Ported Throttle Body, 180° Thermostat, NGK Iridium TR6IX)

1997 Chevrolet Silverado K1500 4x4 350
(soon to come,true dual exhaust, roll-up access tonneau cover, light bar)



Check this out! (Good Stuff)
Honda Cog Commercial