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91 camaro severe backfire 91 camaro. 350 tbi,5spd car was running fine, now it surges bad under hard acceleration,has severe explosive backfiring...unplugging the tan and black wire connector under the hood and the car is drivable,under acceleration check engine light cuts off then back on..codses 42 and 23..new coil, ignition module,plugs cap and wire |
Re: 91 camaro severe backfire Just took a ride .shifting under 2800 it runs fine..cruising at 50 with no isuues...but hard acceleration and the problems start |
Re: 91 camaro severe backfire Check your fuel pressure..... //RF |
Re: 91 camaro severe backfire new fuel pump,thought that was part of the problem |
Re: 91 camaro severe backfire could a knock sensor cause these problems? |
Re: 91 camaro severe backfire
Originally Posted by irocwagon
(Post 5820595)
could a knock sensor cause these problems? does it occur when engine is cold, only in closed loop, or both scenarios? |
Re: 91 camaro severe backfire Check the pickup coil/ignition module connection for correct orietation. It is possible to reverse the pickup coil connection and have the module retard the timing on acceleration rather than advance it. |
Re: 91 camaro severe backfire
Originally Posted by Fast355
(Post 5821356)
Check the pickup coil/ignition module connection for correct orietation. It is possible to reverse the pickup coil connection and have the module retard the timing on acceleration rather than advance it. temp doesnt matter, does it always,closed loop also |
Re: 91 camaro severe backfire
Originally Posted by irocwagon
(Post 5819957)
has severe explosive backfiring. Backfire out the exhaust may indicate misfire; the misfiring cylinder(s) push the full charge of fuel and air into the hot exhaust system, where it's ignited. Won't take much and the catalytic converter will be broken or melted. I've seen mufflers blown apart from exhaust backfiring due to a faulty diverter valve on the AIR pump, when the mixture went rich as the throttle closed, and the diverter valve dumped air into an overly-rich and hot exhaust stream. Backfire from the intake system could be lean mixture still burning lazily on overlap, igniting the fuel/air in the intake manifold; or it could be wiped exhaust cam lobe(s) leading to excessive residual exhaust in that cylinder(s). Another possibility is a burnt intake valve leaking combustion gasses into the intake manifold. If the vehicle was in my driveway, I'd be doing a compression test, cylinder balance test, and a leakdown test to verify valve sealing and equal cylinder power at idle. That also allows me to inspect the spark plugs. After that, it's Scan Tool time, looking for short- and long-term fuel trim abnormalities; or anything else in the data stream that seems suspect. |
Re: 91 camaro severe backfire
Originally Posted by irocwagon
(Post 5821651)
i thought it wouldnt start if reversed{pink and white wire?} temp doesnt matter, does it always,closed loop also |
Re: 91 camaro severe backfire ok,was thinking ignition not pickup.. thought you were talking about the wires on the outer,ill check under the cap, its a massive backfire, seems like both, but deffi the tailpipe..only does it if tan and black wire is hooked up.. |
Re: 91 camaro severe backfire
Originally Posted by irocwagon
(Post 5821849)
ok,was thinking ignition not pickup.. thought you were talking about the wires on the outer,ill check under the cap, its a massive backfire, seems like both, but deffi the tailpipe..only does it if tan and black wire is hooked up.. |
Re: 91 camaro severe backfire how do i determine if its installed correctly and not reversed other than swapping it around |
Re: 91 camaro severe backfire also, the car starts every time the first time |
Re: 91 camaro severe backfire
Originally Posted by irocwagon
(Post 5821870)
how do i determine if its installed correctly and not reversed other than swapping it around If so, I'd be looking to see that the white wire was connected to the "W" terminal, and the green wire was connected to the "G" terminal. |
Re: 91 camaro severe backfire
Originally Posted by irocwagon
(Post 5821870)
how do i determine if its installed correctly and not reversed other than swapping it around Turn off the engine and leave it at key-off. Reconnect the EST/BYPASS connector and start the engine. Check the timing again with the light. The timing mark on the damper should now be more advanced then 0*, likely around 18* BTDC. This has the timing mark on the damper moving toward the passenger side of the vehicle. If the timing mark on the damper moves toward the drivers side the pickup coil wires are backwards. I've seen this with brand new pick up coils. RBob. |
Re: 91 camaro severe backfire will attempt tonight..also new distributor and pickup, few months back |
Re: 91 camaro severe backfire man im scared to reconnect that..last backfire it was in the garage when it happened,it knock the dust off the walls,went from being clean to complete dust covered |
Re: 91 camaro severe backfire Any update on the backfiring? I seem to be having the same problem as you and cant figure it out...would apreciate some help! |
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