mysterious 35-50 bumping engine
10-06-2008, 03:04 PM
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mysterious 35-50 bumping engine
my 99 4.6L v8 4x4 is acting like the engine wants to come out of the truck when i reach up to around 45mph i have had people say it could be the overdrive sensor gone bad but im not sure what it is could anyone give me some more ideas as to what it could be causing the bumping when shifting
10-07-2008, 03:10 PM
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10-08-2008, 01:58 PM
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I think we need more information to be able to help you diagnose your problem.
1) Automatic or Manual transmission.
2) What RPMs does the rock'in start and end.
3) What was the last thing you did to the truck before these symptoms arose.
4) Is the check engine light illuminated and has the codes been scanned.
Your bucking may be caused by a vaccum leak, timing, interuption of fuel, etc. Just about anything you can think of that can cause a engine miss could be your culprit. With a lil' more infomation I think we could be on our way to getting you issue resolved.
1) Automatic or Manual transmission.
2) What RPMs does the rock'in start and end.
3) What was the last thing you did to the truck before these symptoms arose.
4) Is the check engine light illuminated and has the codes been scanned.
Your bucking may be caused by a vaccum leak, timing, interuption of fuel, etc. Just about anything you can think of that can cause a engine miss could be your culprit. With a lil' more infomation I think we could be on our way to getting you issue resolved.
10-08-2008, 02:06 PM
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I think we need more information to be able to help you diagnose your problem.
1) Automatic or Manual transmission.
2) What RPMs does the rock'in start and end.
3) What was the last thing you did to the truck before these symptoms arose.
4) Is the check engine light illuminated and has the codes been scanned.
Your bucking may be caused by a vaccum leak, timing, interuption of fuel, etc. Just about anything you can think of that can cause a engine miss could be your culprit. With a lil' more infomation I think we could be on our way to getting you issue resolved.
1) Automatic or Manual transmission.
2) What RPMs does the rock'in start and end.
3) What was the last thing you did to the truck before these symptoms arose.
4) Is the check engine light illuminated and has the codes been scanned.
Your bucking may be caused by a vaccum leak, timing, interuption of fuel, etc. Just about anything you can think of that can cause a engine miss could be your culprit. With a lil' more infomation I think we could be on our way to getting you issue resolved.
10-08-2008, 02:23 PM
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I recently had a similar issue with my '01 F150. My truck would spit and sputter between the range of 1500-2000 rpms. What I found was that the vacuum quick disconnects on the EVAP TEST Port located on the firewall by the master cylinder were leaking by. there is a rubber seal that hardens under the heat of the engine and allows leak-by. I simply removed the quick disconnects and pushed the vacuum hose directly to the Test Port and secured ithem with small hose clamps.
I actually found this fix by accident after replacing the vaccuum hose from the intake to the EVAP test port. My problem went away only to return shortly there after.
Check this out on your engine. IT'S FREE!!
I actually found this fix by accident after replacing the vaccuum hose from the intake to the EVAP test port. My problem went away only to return shortly there after.
Check this out on your engine. IT'S FREE!!
10-11-2008, 05:25 AM
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im currently undergoing with this problem myself and after a week of being ok and 200 buck later i now have a mutiple missfire and the engine feels like its running on half the engine,but i have check engine lights to back this....
does the engine feel worse or better when its in ot out of torq converter lock out (aka about 450-500 rpm's)
does the engine feel worse or better when its in ot out of torq converter lock out (aka about 450-500 rpm's)