Bronco lunges forward on cold start
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Joined: Dec 2012
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Bronco lunges forward on cold start
Hey gents, I have a 1996 Ford Bronco XLT 5.8L automatic. Every time I go to start it, when it is cold, it will lurch forward in park. If it is on a flat surface and in neutral, it can actually move about a foot on a real cold start. If it is an inclined driveway (in neutral) and it is on, I can release the brake and it will hold in its position without rolling back out of the driveway. Finally, if it is in drive and I let it go by itself, it will pick up pretty good speed on its own- not a typical creep in 1st gear. I have searched the threads but I have not really seen anyone come up with a solution to their problem. Some have suggested the trans linkage on column under the dash and another suggested to flash the SW or TSB. One last theory was to check the motor mounts. Any suggestions to this particular problem?
Post Fiend
Joined: Nov 2011
Posts: 8,908
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From: Algona, Washington
I don't know to much about the E4OD transmissions but it would seem like something inside the tranny itself is causing it to not fully come out of gear. As for the pickin up speed on it's own, that might just be the nature of a bronco. From the old brochure's i have read they are supposed to idle up a hill. I don't know if it's true or not but the more experience guys here will know better i think.
Posting Guru
Joined: Apr 2005
Posts: 2,018
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From: Longview, TX
1996 was the first year of a different engine management system but the principles are about the same. Start with pulling and writing down the codes from three tests, KOEO, CM, KOER. The E4OD transmission is electronically controlled by the PCM (computer). Pull codes and post them for the best assistance. With it being cold related I would guess ACT or ECT sensors but check codes. Also check for vacuum leaks.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Make absolutely certain the two screws at the base of the shift lever in the steering column are tight. They work loose over time and the lever gets sloppy allowing the transmission to not be fully engaged in the gear selected. You can access the hardware from below the column where the shaft that is in the column attaches to the linkage that drops down to the transmission. The issue sounds more like a mechanical hiccup than an electronics problem.
If the engine idles high enough to "drive" the truck, look for vacuum leaks and/or a throttle body that has been tampered with. In-gear idle should be below 1000 rpm.
If the engine idles high enough to "drive" the truck, look for vacuum leaks and/or a throttle body that has been tampered with. In-gear idle should be below 1000 rpm.
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jrm4jrm4
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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May 20, 2013 02:40 PM
