DTA Posted February 26, 2017 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
DTA Posted February 26, 2017 Author Posted February 26, 2017 Carb or TBI? Can't tell in your pic. TBI, sorry i should've added that
HOrnbrod Posted February 26, 2017 Posted February 26, 2017 Good troubleshooting article for 2.5 TBI HERE. I'd start with a fuel pressure test with engine running.
DTA Posted February 27, 2017 Author 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?
88whitemanche Posted February 27, 2017 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....
DTA Posted February 27, 2017 Author 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
88whitemanche Posted February 27, 2017 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
87Warrior Posted March 1, 2017 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?
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