90 e150 5.8 efi timg issue
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90 e150 5.8 efi timg issue
Hello,
van starting run rough thought it was bad fuel(say for awhile) did a full tune up fuel filter checked fuel pressure, it's fine35-40psi. This thing won't get out of it's own way it struggles to get to 35 mph and occasionally pops through the intake at wot. Checked the firing order cap and rotor are new along with wires and plugs. Just for fun I put a light on it with the spout out and it's dead on 10° btdc turned van off plugged spout back in and still 10° rev it up same 10° no fluctuation whatsoever. This motor is newer, rebuilt back in 95 w/ less than 5k. It used to run awesome so I know all the timing stuff was set up rite. Any ideas im pulling my hair out and for the first time ever my wife said.i was turning into a real A-HOLE. Please help if u can
Thanks
van starting run rough thought it was bad fuel(say for awhile) did a full tune up fuel filter checked fuel pressure, it's fine35-40psi. This thing won't get out of it's own way it struggles to get to 35 mph and occasionally pops through the intake at wot. Checked the firing order cap and rotor are new along with wires and plugs. Just for fun I put a light on it with the spout out and it's dead on 10° btdc turned van off plugged spout back in and still 10° rev it up same 10° no fluctuation whatsoever. This motor is newer, rebuilt back in 95 w/ less than 5k. It used to run awesome so I know all the timing stuff was set up rite. Any ideas im pulling my hair out and for the first time ever my wife said.i was turning into a real A-HOLE. Please help if u can
Thanks
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You need to verify that the spout circuit is electrically complete which means disconnecting the harness from the computer to probe it with a multimeter, so while you have that done remove the PCM and inspect it for blown or damaged capacitors or other damage. It wouldn't be surprising to find this damage on a computer of this age but if it has already been replaced at some point that may not be the case. The other component that is integral to timing control is the Ignition module on the side of the distributor, this should be a grey module on this vintage truck, if you have a black module that is wrong and is contributing to your problem, replace with a grey module. These modules also have several different types of failure modes so even if you have a grey module it may need to be replaced.
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Thanks I found.it but it's burried behind the e-brake bracket. Does it have to come out? Im pretty this is my problem considering there's a bunch of white **** coming out of the pcm housing rite where the harness plugs in. Are these mounting bolts 10mm?
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Yes the PCM should come out for inspection. I believe there is 1 small bolt or screw holding it in, remove that and you can shimmy it out of the rubber gasket the connector fits through in the firewall. Then remove the cover on the PCM and have a look, any corrosion on the circuit board or signs of leaking from the capacitors(little can devices) and it should be replaced.
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Big negative on that! Yes it's inside yes it's on driver's side not behind kick panel but above sandwiched in between the body and the e-brake bracket held in by 2 burried 15/32 bolts. It'll be interesting to see how those bolts go back in. I was expecting a "computer" all I got was a crusty metal box. The serial # starts FOUF-2C018-AA.
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I think I pulled the abs control module? It was the only computer looking thing over there on the driver's side kick panel. I took the panel off and there was nothing there I looked up and left and there was a metal box so I took it out. I ran the numbers and it comes back ads module
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If this is not what you had to do then you do not have the engine computer. The PCM is behind the panel to the left of the parking brake assembly.