Running Rough PLEASE HELP!
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Freshman User
Joined: Mar 2004
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Running Rough PLEASE HELP!
Hey guys here's my problem. Tranny went out on my bronco (4.9L I6), it sat for 3 weeks. When I got it moving again, the engine started acting funny. On occasion when I start it the idle drops dramatically almost killing it (I can watch the volt guage move from 10-14 volts) but it will clear up once I give it a rev. And at a cruising speed of about 40 it will jerk off and on, pretty sure it has to do with the rpm range but I don't know what is making it run so rough. Also when it is cold it will often die if I try to turn the wheel as I back out of somewhere or something. I was going to replace my oxygen sensor, if it isn't solved by that I was going to do the fuel filter, and then have to injectors cleaned. What is giving me so much trouble?!?!
Thanks,
Sam
Thanks,
Sam
New User
Joined: Mar 2005
Posts: 5
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Originally Posted by BiggerThanBlazer
Hey guys here's my problem. Tranny went out on my bronco (4.9L I6), it sat for 3 weeks. When I got it moving again, the engine started acting funny. On occasion when I start it the idle drops dramatically almost killing it (I can watch the volt guage move from 10-14 volts) but it will clear up once I give it a rev. And at a cruising speed of about 40 it will jerk off and on, pretty sure it has to do with the rpm range but I don't know what is making it run so rough. Also when it is cold it will often die if I try to turn the wheel as I back out of somewhere or something. I was going to replace my oxygen sensor, if it isn't solved by that I was going to do the fuel filter, and then have to injectors cleaned. What is giving me so much trouble?!?!
Thanks,
Sam
Thanks,
Sam
I have this exact same problem with my 95 F-150 i ran the codes and it came back with a code 33 but i'm not entirely sure that this is the intire problem any help would be greatly apreciated it's driven me nuts..
Elder User
Joined: Dec 2003
Posts: 660
Likes: 3
From: Northern California
This is for both of you guy's.....
Check for vacuum leaks.
A few known spots to look for would be:
Vacuum tree into the intake---mine was loose and needed 3 full turns to get it back nice n' snug.
Check and clamp if necessary the hose going from the PCV to intake vacuum tree. Those vacuum hoses see a lot of heat and cooling and after more than a decade of use mine was leaking at the PCV valve AND at the vacuum tree. A couple of small hose clamps fixed that problem !!
The throttlebody to intake gasket. It's an easy inexpensive repair.
Upper to lower intake gasket. A little more difficult to change but a common vacuum leak source.
Egr valve---A "brand new" aftermarket one leaked on my truck from day one.
EGR sensor--You'll need a handheld vacuum pump to check it. If it's leaking, it'll cause you problems.
Good luck and let us know what you find,
Bob
Check for vacuum leaks.
A few known spots to look for would be:
Vacuum tree into the intake---mine was loose and needed 3 full turns to get it back nice n' snug.
Check and clamp if necessary the hose going from the PCV to intake vacuum tree. Those vacuum hoses see a lot of heat and cooling and after more than a decade of use mine was leaking at the PCV valve AND at the vacuum tree. A couple of small hose clamps fixed that problem !!
The throttlebody to intake gasket. It's an easy inexpensive repair.
Upper to lower intake gasket. A little more difficult to change but a common vacuum leak source.
Egr valve---A "brand new" aftermarket one leaked on my truck from day one.
EGR sensor--You'll need a handheld vacuum pump to check it. If it's leaking, it'll cause you problems.
Good luck and let us know what you find,
Bob
New User
Joined: Mar 2005
Posts: 5
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i have found the culprit and the cure... The gasket where the throttle body and intake meet had collaspsed and was sucked in patially blocking the flow... It was throwing all the sensors haywire... if you are getting an egr realted code be sure too check the gasket unfortunatley it is a dealer only part so make sure you can get it ordered first : ).
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