Joes4x4Ranger
Well-Known Member
- Joined
- August 7, 2006
- Messages
- 251
- Reaction score
- 1
- City, State
- The center of Hell, Parker, Arizona!
- Year, Model & Trim Level
- '91 XLT
Alright, how smooth is a stock 91 4.0 W/Manual Trans supposed to Idle? I just put in a Motorcraft Reman engine, and it idles ****ty, just like the blown head gasket POS I took out. No CEL, No Codes, just a ****ty idle. When I swapped parts over, they were METICUISLY CLEANED. Every part of the intake system was cleaned better than a 5 start restaurant plate inside and out including the MAF. Fuel injectors replaced with NEW Design III. New plugs, and wires, new air filter, IAC and O2 sensor replaced last year.
Why won’t this thing Idle smooth and steady? It has a rough, rolling Idle, inside the rig I see the TACH fluctuate 50-75 rpm and the gear shifter shakes. With the hood open I can see the engine shaking slightly like a vacuum leak. EVERYTHING IS TIGHT. All plastic lines were scraped and new rubber lines installed. I unplug the MAF and the Idle is 200 RPM higher and steady, but the engine still shakes. I unplug the IAC and it nearly stalls. Could the PCM be puked? The one area I have not gone after is fuel filter( looks very new) and Pressure regulator. I’m in the poor house because of this POS truck.
I'm expecting a ROCK SOLID SMOOTH AS SILK IDLE. I want to be able to balance an egg on the hood with the engine running. I want it to idle so smooth I can’t tell its running. AM I ASKING TOO MUCH???? IS THIS POSSABLE FOR THIS ENGINE???I just spent $2200 for the long block and the Mother F###er still runs like ****. FRUSTRATED FRUSTRATED, FRUSTRATED!!!! If the blue book valued the piece of **** higher than the long block cost I’d full insure it and drive it into Lake Havasu.
Why won’t this thing Idle smooth and steady? It has a rough, rolling Idle, inside the rig I see the TACH fluctuate 50-75 rpm and the gear shifter shakes. With the hood open I can see the engine shaking slightly like a vacuum leak. EVERYTHING IS TIGHT. All plastic lines were scraped and new rubber lines installed. I unplug the MAF and the Idle is 200 RPM higher and steady, but the engine still shakes. I unplug the IAC and it nearly stalls. Could the PCM be puked? The one area I have not gone after is fuel filter( looks very new) and Pressure regulator. I’m in the poor house because of this POS truck.
I'm expecting a ROCK SOLID SMOOTH AS SILK IDLE. I want to be able to balance an egg on the hood with the engine running. I want it to idle so smooth I can’t tell its running. AM I ASKING TOO MUCH???? IS THIS POSSABLE FOR THIS ENGINE???I just spent $2200 for the long block and the Mother F###er still runs like ****. FRUSTRATED FRUSTRATED, FRUSTRATED!!!! If the blue book valued the piece of **** higher than the long block cost I’d full insure it and drive it into Lake Havasu.