engine not running right
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Senior User
Joined: Sep 2003
Posts: 335
Likes: 0
From: NJ
engine not running right
I have a friend with a 91 EB Bronco 5.0 and here is the problem... the engine is runing like crap. I have replaced the plugs, wires, cap, rotor, PCV, air filter. breather filter and fuel filter. When I pulled the old plugs out, they were wet and you could smell the raw fuel on them. The CEL is on, so I tried reseting the computer but that did not help. I'm thinking that it is the O2 sensor, but am not really sure. The truck cranks a little long, but will start and stay running, until you try to shift out of park. When shifting into reverse, the RPM's drop and it stalls. So the only way to move it in reverse is to two foot it.... one foot on the brake and the other on the gas. The same thing happens when shifting into drive... however, once you get moving everything is fine. Even when coming to a stop the engine has no problems with keeping running.
There is also another problem that could be related, but not sure... when restarting the truck after a stall... the guages 'flip' out. What I mean is they flucuate radically. Could this all be realted, cause I'm thinking that it could use an alternator as well. Considering it's got a 167,000 on the original.
Let me know what you all think so I can help her out.
There is also another problem that could be related, but not sure... when restarting the truck after a stall... the guages 'flip' out. What I mean is they flucuate radically. Could this all be realted, cause I'm thinking that it could use an alternator as well. Considering it's got a 167,000 on the original.
Let me know what you all think so I can help her out.
Freshman User
Joined: Sep 2003
Posts: 46
Likes: 0
From: Roseville
if you can see and smell gas on the plug, maybe the spark isn't what it should be? might try replacing the coil and or TFI module located on the distributor. MSD makes a good replacement TFI coil that's only like $50. good luck.
Elder User
Joined: Dec 2002
Posts: 649
Likes: 1
From: Monterey bay area
look at the fitting on the fuel rail.....have the fuel pressure tested.....a faulty psi regulator will dump too much fuel into the engine wetting the plugs.
Another is a weak spark....coil or module
do get the codes pulled....
Another is a weak spark....coil or module
do get the codes pulled....
