Backfire from intake! 1992 LT-1
Thread Starter
Instructor
Joined: Nov 2012
Posts: 242
Likes: 4
From: Grand Island - Nebraska
Backfire from intake! 1992 LT-1
Car was starting before I replaced water pump on 1992 LT-1. I was very careful to not get the Opti wet. Everything is back together now and it won't start. It has spark since it belched a flame from the throttle body. New injectors, FPR, plugs and MAP. It was suffering from a rich condition before the pump was replaced. Plugs were fouled and the carbon deposits were from this condition. Where to start to look for problem now? I have a new OPti sitting here and I can install it but I wanted to troubleshoot the no start problem first. Has anyone ever had a bad Opti cause a back fire such as this. The opinion I have read on the forums is that it just quits. Stored codes are H42 and H64. I found a bad plug wire while changing the plugs and I am waiting on a new set to arrive. I tried to start it with the injector with no wire to the plug disconnected. Not the smartest thing I guess but every V8 I have had will start and run on 7 cylinders. In the starting sequence, the coolant sensor is involved to some degree and it is new so I would like to rule it out as suspicious. Is there a way to ohm it out? Sorry this is so long but I am puzzled...Thanks!
Le Mans Master
Joined: Mar 2001
Posts: 7,999
Likes: 14
From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '12
Follow the trouble shooting trees in the FSM
Make sure the cable from the opti to the ECM connector on the pass side is WELL seated at both ends!
Good luck
Make sure the cable from the opti to the ECM connector on the pass side is WELL seated at both ends!
Good luck
