backfire through intake, little acceleration
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Junior User
Joined: Jul 2003
Posts: 54
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backfire through intake, little acceleration
I have an '89 Ford Ranger, 6cyl 2.9L. When I give it gas and try to accelerate, it boggs down, has little power, and then backfires through the intake. The codes that I am getting are 77 and 74, Operator error on balance test and brake. No help there. I did a fuel pressure test and got 35 psi and have also been able to rule out the pressure regulator with a vacuum pump. I disconnected one sensor at a time and no improvements. My #4 cylinder pressure is down to 50 psi and a wet test shows that it is the piston ring. The cylinders are out of balance when spark plug wires are removed ona at a tim, but could that be the problem? If you could give me some advice, I'd be really stoked... Thanks....WoodstockAz
. runs much better now
Thread Starter
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Junior User
Joined: Jul 2003
Posts: 54
Likes: 0
backfire through intake, little acceleration
Wouldn't the problem temporarily clear up if I disconnected the O2 sensor? I tried that and it didn't work..........I checked the timing and it was right on, only there is a mounting bracket right next to the pulley that has nothing on it, I think there might be a missing timing sensor. Does anybody know if an '89 Ranger, 2.9l has a timing sensor mounted next to the pulley? and if so, could that cause this problem?
Post Fiend
Joined: Dec 2001
Posts: 10,562
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From: South Jersey
backfire through intake, little acceleration
It would change if there was a problem, the ECU would use the default inplace of the O2 reading. No sensor.
When you gut the cat the empty cat allows the exhaust gases to expand and cool, hot gases flow better. Also you lose the pulses and they tend to pull each other alone.
When you gut the cat the empty cat allows the exhaust gases to expand and cool, hot gases flow better. Also you lose the pulses and they tend to pull each other alone.
