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1990 Bronco 302 ,6" suspension lift ,37.5" tires
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Discussion Starter #1
Hi everyone
My 1990 bronco 302 idles great, dies on acceleration

I can’t read codes with the jumper method as the whole check engine light socket was taken out before i had it.


i put new plugs. New fuel filter
Wires look good from last summer
Tried another coil
looked at the vacuum they seem good
Going to go buy a fuel pressure gauge to

I when i put new plugs in the old ones were witheish on the ends
In neutral i can rev it slowly up to about 4000
Any time i punch it it just bogs up
In gear runs like shit bogs down anytime i try to accelerate



any ideas what else to check for these symptoms would be appreciated

thanks
 

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24,974 Posts
Yo New,
Welcome!
Some no code usual suspects by Ford;
Vacuum leak, see my leak diagnosis link in post #11
Excerpt;
"
The vacuum gauge should read between 15 and 22 in-Hg depending upon the engine condition and the altitude at which the test is performed. SUBTRACT ONE INCH FROM THE SPECIFIED READING FOR EVERY 1,000 FEET OF ELEVATION ABOVE SEA LEVEL.
The reading should be quite steady. .
When engine is rapidly accelerated (dotted needle), needle will drop to a low (not to zero) reading. When throttle is suddenly released, the needle will snap back up to a higher than normal figure.
Or Air Conditioning when in MAX mode may switch to Defrost."



161760

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 for corrosion, etc, at coil, firewall, ICM, distributor, PCM, etc. Especially those with broken locking tabs.

You can try to wire in a self test connector from a yard queen using STOCK WIRING;
161761

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Here are the 1990 Bronco Pre-Delivery Shop & Electrical & Vacuum Troubleshooting Manuals (EVTM), Partial by member Kingfish999 in Google Drive @ 1990 Ford Truck service manuals - Google Drive
Suggest you download for faster scrolling and to use the table of contents index.

1990 Ford Bronco Brochure, partial by El Kabong @ 1990 Ford Bronco Brochure pictures, videos, and sounds | SuperMotors.net

Register with VIN to see most Ford dealer maintenance/repairs done @ any dealership nation-wide @ Welcome to Ford Owner | Official Ford Owner Site

For any Bronco issues or to chat about it's planned modifications or build, it's better to post each seperately in Noobie Bronco Tech Questions. Flame free zone. This will get more attention and you can build up your post count to get into other sections such as Bronco and Ford Parts/Accessories that requires 75 non-padded posts to participate due to scammers who preyed on our members.

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Bronco info is now able to be put under your user name.
Click your profile button in the top right and go to account settings.


On that first page, named Account Details, scroll down to "Vehicle Info" and type in up to 100 characters.

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1990 Bronco 302 ,6" suspension lift ,37.5" tires
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7 Posts
Discussion Starter #3
thanks for the great info
I am working away all week but will be back next weekend with new toys to test fuel pressure , vaccums , code reader.

will be back with more results and better details

thanks again
 

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1990 Bronco 302 ,6" suspension lift ,37.5" tires
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7 Posts
Discussion Starter #5
check your Ignition Control Module (ICM). it is connected to your distributor. it could be cracked and when you accelerate it could loose connection and cause the engine to stall. it is a cheap part and easy to check and replace. good luck
Thanks
I picked one up this week as it was the only spare ignition Part I didn’t have an xtra of that i could not troubleshoot.
I changed it last year for a no start issue so no spare

toys picked up this week
fuel pressure gauge
Vacuum gauge
Compression gauges

could not find a code reader all they have are the OBD11 around and there is no socket for the check engine light

thanks and i will update my findings

I’m sure i will have fun working on it tomorrow when i get home
 

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1990 Bronco 302 ,6" suspension lift ,37.5" tires
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7 Posts
Discussion Starter #6
Posted a new thread in proper noobie Forum that has my diagnosis results so far.
Thanks all
 

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If you're confident the vacuum lines are correct with no leaks I'd replace the EGR. At least that was the culprit when this happened to me.
 
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