Devan
Well-Known Member
- Joined
- April 18, 2017
- Messages
- 171
- Reaction score
- 34
- Location
- central jerz
- Year, Model & Trim Level
- 01 BoostedXPLR Sport
- Callsign
- Devman
I have an Eaton M90 01 XPLR sport 2 dr 4.0 v6 sohc with a crank no fire problem. It turns over but does not fire, inertia switch is fine, pats system is fine and its def reading the keys transponder. The truck was running fine, I came home, parked it, came back to the truck a cpl hrs l8r to start it and it cranked but no fire. So i looked at my analog and digital fuel gauge and realized after priming the pump that the fuel pressure was bleeding off too quick. I built a hatch into the floor under the backseat for fuel pump access so I dont have to drop the tank everytime I wanna get to the dam pump. So I checked the pump assembly out and 1 of the 2 rubber lines had a crack in it and was just letting fuel squirt back into the tank so i replaced the rubber lines with much better line resistant to fuel, and I put more gas in it. The fuel pressure after priming stays constant now, but it still cranks and doesnt fire . I replaced the cam and crank sensors, i still have to test continuity between the cam and crank sensor connectors and the pcm connector, i also tried another coil pack. The coil pack is getting 12 volts on pin 1 or 4, i forget which one is power and the other 3 pins on the coil pack connector (which also go to the PCM connector) see nothing during crank(or I think I saw ground on those pins) which leads me to believe the pcm is not commanding the coil pack to spark, I also popped one of the spark plug wires off the coil and put it close to the coil plug to see if I could get a spark to go between the 2 and it didn't. If i have to replace the pcm that would be a big pita cuz i have diff injectors and a diff maf with a tune so if anybody has any ideas what kind of problem im dealing with besides a pcm replacement that would be great although the check engine light during Key On signifies that the PCM is good I think, ill have to dbl check that. During cranking but not firing, I think i saw power at the injector connectors. Im thinking maybe its a possibility the engine is flooded although their is no fuel on the dipstick and i still have to pull the plugs out to see if they are wet and stick a camera in each spark plug hole to see if fuel just sits in the chambers after crank no fire . The engine bay battery junction box relays and fuses and cabin fuse box fuses are fine although i should prolly test continuity from each relay female pin in the engine fuse box like for the pcm relay etc back to wherever they go, and I still have ignition wires to test under the steering column. I gotta check alldata wiring diagrams for that. Engine bay grounds are good, all fuses have power on both sides and at their female pins. I still have other pinpoint tests I have to do, and I should prolly check out the pcv system as well, maybe my catch can is full. Im just looking for a 2nd or 3rd opinions. thx a bunch