Hey guys,

I've got a 92' Bronco with the original 5.0 still in it. I've had a problem that started off intermittent and now has become a serious pain in the *** for me. It started probably a year, year in a half ago, where it would occasionally stall out and die when I first put it in gear on cold mornings. I always let it idle high like it wants to for the first minute or so it's cut on.

I did some looking around and saw the cleaning the IAC, check the TPS, etc routes. I've actually done those, and I'm assuming when I first did them it helped. Before doing it I sometimes would press the gas pedal a couple times and it'd be fine. It was also a 50/50 on if the truck would fire back up or if I had to try to force it to start like it's a carb'd engine. It was such a roulette problem that I never really got a hands down yes it fixed it or no it didn't answer.

Forward to very recently, the problem is back in spades and pretty much a daily ordeal. I don't seem to have a problem when I put it in drive, but reverse is an entirely different story. It's evolved from only when the truck's cold to it died on me twice (both today the only 2 times I drove) with the engine warm as soon as I put it in reverse. It's fired right back up all but once out of the recent times, and if I give it gas before it catches itself when I put it in reverse it doesn't die.

I know it sounds painfully obvious that it's probably a IAC/TPS issue, or at least it does to me... however I'm still very inexperienced and uneducated when it comes to vehicles. Do you guys think it's really as obvious as it sounds or could it be something more/different?

I have not had codes pulled, and I know I need to. It's my only vehicle at the moment and just haven't had any time to take it to a shop with a reader that can do it. I've also tried the whole paperclip routine and I couldn't get that method to work. I'd really appreciate you guys' input.

Edit: Transmission is E4OD. Realized how completely stupid I sound complaining about stalling if it was a manual...

 

Did I miss what tranny in the post?

 

Sorry, it's E4OD.

 

Check tranny fluid level and check for cooler lines for leaks (if you have a

Cooler).

 

Is the idle high or normal? If it's normal it could be a problem with the torque converter lock up.

 

all shifts are electric on e4od check all conections on tranny both sides looking for any coroision drivers side tells computer what gear you have selected... this swith may be worn out.. many TSB's on water intrusion causing this symtom...

 

pull engine codes at orielys for free and clear codes....engine stalls when tranny is in reverse and forward at same time... corosion can do this as tiny amounts of voltage tells computer what gear you have selected ..

 

It's been a busy weekend, I hope to go ahead and knock all these out this afternoon. Thanks guys for the help I'll get back to you with what I find as soon as I do.

I don't have a cooler, but I'll check the fluid level.

The high idle is something that's happened since I bought the truck. I used to be able to just give it a little gas and it'd rev down and I could go. Now it seems better to just let it go through it's high idle cycle when I cut it on.

Will do, I'll also see if I can find an O'Riley's around here. I went to advanced awhile ago for something else I was having issues with and they said the couldn't do anything older than a 96', figured other part stores like it would be the same.

 

Hmmmmm...this is a challenging one. Here are my few cents...

Pull codes and get them on paper to report back here, KOEO, CM (this may tell you why it dies), KOER. A $35 code reader is kept in my console always.

With cold issues I would suspect ECT or ACT sensors. I pulled mine and read resistance at different temperatures in my oven and compared them to Fuel Injection Technical Library » Engine Coolant Temperature Sensor (ECT) and Fuel Injection Technical Library » Air Charge Temperature (ACT) and even though neither was throwing a code one was working fine at cold then gave the wrong readings at warm up.

If you have not replaced ALL the plastic vacuum lines with rubber you will be pleasantly surprised at the difference.

Slip the vacuum hose off the fuel pressure regulator and see if gas is in the hose. If so replace FPR. Vacuum is higher at idle and leaking diaphram may be flooding the engine.

The gear shift puts the transmission in park and maybe neutral mechanically. The MLPS is the switch on the shift shaft that allows starting, backup lights and tells the PCM what gear you selected. I cannot think of a reason a bad or mis-adjusted MLPS would cause the engine to die in reverse.

Bottom line, I would start with the CM, Constant Memory, code which displays immediately after KOEO. There is my $.05 worth.

 

The E4OD ATF level is low, check it iddling in park after a grocery drive. When the fluid gets too low the trans filter falls inside the pan, I'm not completely sure why, but when the filter gets disconnected the condition you described shows. If after topping the fluid level the truck keeps acting up you will probably need to take the pan off in order to put the filter back in place, you could even replace it with a new one, they're inexpensive.

 

I am willing to bet your transmission filter either dropped in the pan or is dislogged a bit. This is a known issue with the e40d with symptoms your discribing.