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Listen for the fuel pump energizing when you turn the key to start. If you don't hear anything replace the Grey relay on the Green connector for the fuel pump relay. Drivers side next to the Air Cleaner box. There are three of them but only one is green which is the fuel relay. I got one on...

Just asking. Is this flat tappet or roller heads on this long block? I have a roller block with flat tappet heads and cam. Firing order was different for a roller block with roller heads. I have a 90 Bronco 5.0 EFI.

I would replace the Master cylinder. Sounds like one of the seals might have torn. If the power booster was bad you would hear it by the pedal. Don't forget to bleed from back to front.

When it doesn't work with the key at all check the latch on the drivers side in the tailgate. Sometimes it isnt seated all the way to make the connection. On your issue is sounds like the bushings inside the motor might be crumbled. Also like previously mentioned it could be off track. You...

Sounds like a clutch pack might me going. I would drop the pan and see how much junk (greyish/black) sediment is in the bottom. My AOD went south and I did an overhaul myself really easily on my 90 4x4.

Replace the fuel filter on it and the the fuel pressure regulator. $30 bucks max. Mine had issues like this also. The diaphragm in my fuel pressure regulator was damaged. Another good tune up to do is the Throttle Posistion Sensor (TPS) Mine would stick and intermittenly act stupid. 1990...

Check your wiring hardness forward the battery to the headlights for corrosion. I looked under the tape and found a green spot in the wiring. Fixed it and no more low voltage. Truth be told I just traced the wiring harness by wiggling it until something "unatural" happened.

My did the same and this is what I did: Replaced fuel pressure regulator, put iridium plugs in, replaced the fuel filter, replaced the coil, and new cap and rotor. I don't know what fixed it (suspect fuel regulator was the culprit) but it runs like a champ. Really low dollar preventive...

I stopped using you guys since your customer service for my Bronco needs failed me three times in a row.

I found an 88 302 block and rebuilt it myself. Is a flat tappet for my 4x4 1990 Bronco and was really easy to do. You will save lots of money if you have the time and space. Mine had an AOD transmission I rebuilt also that wasn't hard at all either. I used Monster Transmission and Jegs for...

I would replace the fuel pressure regulator. Mine tested fine and it was the problem in the end. Cheap start and only three screws to replace.

My sons 90 Bronco had over drive go out. After a week of WTF I decided to rebuild the AOD. My first dive ever into a transmission but encouraged by the videos on you tube from monster transmission. I ordered a 4x4 kit on Ebay along with a SK AOD kit. For reference I bought the AOD yellow...

I jacked with my back window for days until finally.... Took the switch out of dash and jumped it from there and it didnt work tested the wires from the body to the tailgate LATCH<---- and the latch did not close all the way to complete the circuit. Jumped the motor in the tailgate and it...

I bet its the bushings your motor. Mine did the same and I took it apart. The bushings around the gear rotted and crumbled over time. I actually took the plastic pieces that come with a TV mounting hardware kit and cut them in half. Works perfectly. Wouldn't hurt either to clean and repack...

That goes to a pipe that comes up from your exhaust next to the 02 sensor down below

Dont

After replacing the Idle Control, MAPS, EGR, O2 sensor, Vacuum lines, TPS, and temp sensor my 1990 Bronco 302 EFI would rev high after shifting into park. Backstory was I had check engine light that would intermittently come off and on with abnormal idle so I went on a swapping spree of...