Stalling Problems

[Kegstund]

Hello everyone.

I have an 87 Bronco II that has run in to some problems. The problem presents itself after driving for 20 or so minutes or more. For some reason, which I believe to be some kind of overheating, after driving for the 20 or so minutes, it starts to get jerky (some kind of loss of power) and will eventually stall, and not start up again for about 15 minutes or more. When it does this it attempts to start up but the engine fails to turnover. If I try immediately after it stalls, sometimes it will start up again, and die shortly after. It seems that the longer I let it sit after stalling the more reliable it will be without stalling, and the faster it will start. I brought it to a mechanic who failed to find anything majorly wrong with it, which I find remarkable with 140k miles on it. Anyways, he mentioned flushing the cooling system, but hesitated seeing as it is so old and that the result would most likely be holes in the cooling system, ending up with more problems then I started with. I have just changed the air filter and put in fuel injector cleaner, but I doubt the problem will fix itself so easily. I checked the radiator fluid and its pretty brown, so I think he is right about the system being rusted out.

Anyone run into any similar problems? Recommendations? Questions that I could check under the hood and answer for more feedback? I appreciate any help anyone can give me very much, as I have grown quite the headache from the situation.

Thanks again,

Alex

 

[broncomatt86]

Hello everyone.
I have an 87 Bronco II that has run in to some problems. The problem presents itself after driving for 20 or so minutes or more. For some reason, which I believe to be some kind of overheating, after driving for the 20 or so minutes, it starts to get jerky (some kind of loss of power) and will eventually stall, and not start up again for about 15 minutes or more. When it does this it attempts to start up but the engine fails to turnover. If I try immediately after it stalls, sometimes it will start up again, and die shortly after. It seems that the longer I let it sit after stalling the more reliable it will be without stalling, and the faster it will start. I brought it to a mechanic who failed to find anything majorly wrong with it, which I find remarkable with 140k miles on it. Anyways, he mentioned flushing the cooling system, but hesitated seeing as it is so old and that the result would most likely be holes in the cooling system, ending up with more problems then I started with. I have just changed the air filter and put in fuel injector cleaner, but I doubt the problem will fix itself so easily. I checked the radiator fluid and its pretty brown, so I think he is right about the system being rusted out.

Anyone run into any similar problems? Recommendations? Questions that I could check under the hood and answer for more feedback? I appreciate any help anyone can give me very much, as I have grown quite the headache from the situation.

Thanks again,

Alex

check water pump (rusty water bad sign)and coolant mix, timing, cat converter clogged,head gasket or cracked head and fuel filter and return line (if applicable)and im not sure but there might be a temp sensor issue too causing stall my v6 mustang did this it was timing at first then water pump.

 

[broncomatt86]

oil pump is another idea

 

[miesk5]

yo,

Do you have a Check Engine Light ON?

Anyway on or off, a:

Self Test & Connector Location & pics, Bronco & Ford BEST PROCESS WITH DIAGRAMS! Source: by Ryan M

Are there signs of overheating, such as coolant loss?

The symptoms appear to be the old Thick Film Ignition (TFI)

Ford TFI Module Failure

Anytime a Ford TFI module is diagnosed as having failed, several steps should be followed.

1. Verify charging system operation; specifically, charging voltage.

2. Verify ignition system operation; specifically, there are no open or disconnected plug wires.

3. Remove distributor cap and inspect connections where TFI module hooks to the Hall Effect Switch connector. If there is any sign of deterioration at the connector, the Hall Effect pickup must be replaced. Crankcase vapors are forced into the distributor due to excessive crankcase pressure due to a worn engine or an improperly maintained PCV system. The crankcase vapors cause deterioration of the insulation around the connectors causing the module to short out.

Also check connectors/wire strands, etc.

TFI Module Recall Article Source: by summitlake.com

If it is the Hall Effect, most replace entire distributor w/ a reman unit.

 

[Kegstund]

I will check all of these things out, thanks alot guys.