DTA Posted February 26, 2017 Share Posted February 26, 2017 Just picked up a 1987 2.5l 5 speed for my cummins project down the road. But would like to get this motor running well for the time being before it's pulled. Ive never owned a 2.5l so this is a new experience for me. I fire it up and it'll stall right away unless I feather/tap the throttle for sometime (holding down the throttle will cause it to stall after a few seconds) then it'll run no problem for a few minutes then start to bogg down and I'll have to feather/tap it again to get it back to idle. The previous owner just installed a new fuel pump, filter, plugs, wires, and cap. I was thinking maybe something to do with the egr? Any help would be appreciated Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 26, 2017 Share Posted February 26, 2017 Carb or TBI? Can't tell in your pic. Link to comment Share on other sites More sharing options...
DTA Posted February 26, 2017 Author Share Posted February 26, 2017 Carb or TBI? Can't tell in your pic. TBI, sorry i should've added that Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 26, 2017 Share Posted February 26, 2017 Good troubleshooting article for 2.5 TBI HERE. I'd start with a fuel pressure test with engine running. Link to comment Share on other sites More sharing options...
DTA Posted February 27, 2017 Author Share Posted February 27, 2017 Good troubleshooting article for 2.5 TBI HERE. I'd start with a fuel pressure test with engine running. Lots of fuel pressure, just actually disconnected the vacuum line running to the MAP sensor and shes not stalling anymore. I was getting the right voltage from the MAP sensor when i tested it, but could it still be bad? Link to comment Share on other sites More sharing options...
88whitemanche Posted February 27, 2017 Share Posted February 27, 2017 That's weird usually when the vacuum line to the map sensor would make the truck run really bad... Can you take pictures of the vacuum line set up? Might be in the wrong place? Also double check if your cps wiring isn't touching the exhaust manifold.... Link to comment Share on other sites More sharing options...
DTA Posted February 27, 2017 Author Share Posted February 27, 2017 That's weird usually when the vacuum line to the map sensor would make the truck run really bad... Can you take pictures of the vacuum line set up? Might be in the wrong place? Also double check if your cps wiring isn't touching the exhaust manifold.... Seems to be in the right spot, and the cps is not touching Link to comment Share on other sites More sharing options...
88whitemanche Posted February 27, 2017 Share Posted February 27, 2017 Ok just to get started do cruisers remix tips, http://cruiser54.com If it still doing it after that, I'd say do a refresh for a full tune up including a new icm,coil, starter relay Link to comment Share on other sites More sharing options...
87Warrior Posted March 1, 2017 Share Posted March 1, 2017 Does the truck idle once at operating temperature? Does it rev up fine with the throttle input and feathering? Can you hear the idle speed motor resetting when it shuts off? Link to comment Share on other sites More sharing options...
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