Hi all I am new and I have a problem I have an 1987 bronco EB and my truck stopped one night about 6 months ago and I have about 7 people some are mec. and they all said something different was wrong with my Bronco so replaced it and still nothing I have spent over $1,000.00 and now it starts up and runs but when you put it in ear it stalls then if you can keep it running it cuts out like it is bucking. Help anyone
87 won't stay running
- Thread starter Dewman69
- Start date
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Yo Dewman69,
Welcome!
I will try to move this to the 80-96 Ford Bronco Tech Support section for better visibility. So far, I have failed twice.
Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19 @ http://broncozone.com/topic/25114-check-engine-light-goes-on-and-off/?p=131701
A helper should assist you.
Do test 2 or 3 tines to ensure accuracy.
Ask local mom & pop parts stores if they can loan you a code scanner. Some do with refundable deposit.
Some basics;
The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.
Heat the engine up.
Make sure A/C is off and transmission is in Park (automatic); or in Neutral for a Manual & release clutch.
Then turn off engine, all accessories/lights (close driver's door) , etc.
Do KOEO test First
Post Code(s) here according to:
KOEO
&
KOER
...
Was IAC Valve (aka Idle Air Bypass (IAB)) checked and it and it's passageways cleaned under the throttle body? Here is a test and overview @ http://www.fuelinjectedford.com/page39.html
Location pic in an 88 5.8
Source: by Travis L (kemicalburns)
...
Assuming ita C6 automatic transmission. Check vacuum line to the C6 transmission's, (if equipped) vacuum modulator at rear of tranny on passenger's side.
Pull the vacuum line off the modulator. If fluid comes out of the vacuum line your modulator needs to be replaced. Ensure there is ~15-20 in-Hg vacuum at the line from the intake vacuum tree.
...
See my vacuum leak test in post #20 @ http://broncozone.com/topic/23994-90-58l-getting-continuous-code-33-and-running-code-44/?p=125535
...
Air filter, is it relatively clean?
Air inlet atop radiator support to filter box and to throttle body; look for obstruction; damaged tubing.
Fuel quality; Oxidized fuel often turns darker over time and may even smell sour. You can check stored gasoline by pouring some into a clear glass container and comparing it side-by-side with known fresh gasoline. If your old sample looks noticeably darker than the fresh gas, you have strong evidence the gas has gone bad.
Electrical connectors; inspect at coil, firewall, PCM, etc. especially those with broken locking tabs.
Welcome!
I will try to move this to the 80-96 Ford Bronco Tech Support section for better visibility. So far, I have failed twice.
Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19 @ http://broncozone.com/topic/25114-check-engine-light-goes-on-and-off/?p=131701
A helper should assist you.
Do test 2 or 3 tines to ensure accuracy.
Ask local mom & pop parts stores if they can loan you a code scanner. Some do with refundable deposit.
Some basics;
The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.
Heat the engine up.
Make sure A/C is off and transmission is in Park (automatic); or in Neutral for a Manual & release clutch.
Then turn off engine, all accessories/lights (close driver's door) , etc.
Do KOEO test First
Post Code(s) here according to:
KOEO
&
KOER
...
Was IAC Valve (aka Idle Air Bypass (IAB)) checked and it and it's passageways cleaned under the throttle body? Here is a test and overview @ http://www.fuelinjectedford.com/page39.html
Location pic in an 88 5.8
Source: by Travis L (kemicalburns)
...
Assuming ita C6 automatic transmission. Check vacuum line to the C6 transmission's, (if equipped) vacuum modulator at rear of tranny on passenger's side.
Pull the vacuum line off the modulator. If fluid comes out of the vacuum line your modulator needs to be replaced. Ensure there is ~15-20 in-Hg vacuum at the line from the intake vacuum tree.
...
See my vacuum leak test in post #20 @ http://broncozone.com/topic/23994-90-58l-getting-continuous-code-33-and-running-code-44/?p=125535
...
Air filter, is it relatively clean?
Air inlet atop radiator support to filter box and to throttle body; look for obstruction; damaged tubing.
Fuel quality; Oxidized fuel often turns darker over time and may even smell sour. You can check stored gasoline by pouring some into a clear glass container and comparing it side-by-side with known fresh gasoline. If your old sample looks noticeably darker than the fresh gas, you have strong evidence the gas has gone bad.
Electrical connectors; inspect at coil, firewall, PCM, etc. especially those with broken locking tabs.
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