90 V6 No spark after rebuild
mark61862
06-30-2004, 09:55 AM
working on a FED 1/2 ton 2wd duely.
ran befor rebuilt engine and now has no spark and no check engine light.
all grounds are hooked up , checked the iginiter and ecm in a nother truck, they work. I have power on the wwires at the ecm the the EFI relay turns on.........getting lost here..
ran befor rebuilt engine and now has no spark and no check engine light.
all grounds are hooked up , checked the iginiter and ecm in a nother truck, they work. I have power on the wwires at the ecm the the EFI relay turns on.........getting lost here..
Brian R.
06-30-2004, 10:27 AM
Check to see if there are any codes anyway. There may be some in spite of no CEL.
mark61862
07-01-2004, 08:37 PM
Code gathering is only accomplished by counting the CEL on this model. (I have snap on code scanner) all wires have been checked from the ecm to their ends. have aslo added grounds. CEL circut works, If you ground the CEC at the ECM .
Brian R.
07-01-2004, 09:52 PM
Did you see if the CEL in the other truck works with your ECM?
Assuming you have no idea (sorry if this is obvious)
Step by step;
Spark to distributor.
Check for moisture in the distributor cap/rotor
Check air gap in distributor pick-up 0.008 - 0.020"
Check pick-up coil resistance Ne-G (155 - 205 ohms), G1-G (125 - 200 ohms), G2-G 125 - 200 Ohms)
Check resistance of high-tension wires 25 kOhm
No spark to distributor.
Cams correct on timing belt?
Distributor correct position?
Check ignition coil - igniter connection
Check power supply to coil and ignitor 12V
Check resistance of coil secondary (9.0 - 15.4 kOhms) and primary (0.36-0.55 Ohms)
Check resistance of camshaft position sensor 835 - 1400 kOhms
Check resistance of crankshaft position sensor 1630 - 2740 Ohms
Check IGT signal from ECM - Probably OK since you said you checked the ECM. Is the signal getting to the igniter?
Assuming you have no idea (sorry if this is obvious)
Step by step;
Spark to distributor.
Check for moisture in the distributor cap/rotor
Check air gap in distributor pick-up 0.008 - 0.020"
Check pick-up coil resistance Ne-G (155 - 205 ohms), G1-G (125 - 200 ohms), G2-G 125 - 200 Ohms)
Check resistance of high-tension wires 25 kOhm
No spark to distributor.
Cams correct on timing belt?
Distributor correct position?
Check ignition coil - igniter connection
Check power supply to coil and ignitor 12V
Check resistance of coil secondary (9.0 - 15.4 kOhms) and primary (0.36-0.55 Ohms)
Check resistance of camshaft position sensor 835 - 1400 kOhms
Check resistance of crankshaft position sensor 1630 - 2740 Ohms
Check IGT signal from ECM - Probably OK since you said you checked the ECM. Is the signal getting to the igniter?
mark61862
07-06-2004, 09:02 AM
Found the Problem!!!
the MAF was dammaged inside. Here in colorado its not uncommen to find toyotas with the top taken off the MAF this one was untouched however. It worked unough to run the fuel pump, but 3 of the other conecters had been pulled out and than placed back in. It was our luck that one of the thin metal strips inside had finaly shorted.
Thanks for the help.
and Ill add this to the stories at the campfire!!!
the MAF was dammaged inside. Here in colorado its not uncommen to find toyotas with the top taken off the MAF this one was untouched however. It worked unough to run the fuel pump, but 3 of the other conecters had been pulled out and than placed back in. It was our luck that one of the thin metal strips inside had finaly shorted.
Thanks for the help.
and Ill add this to the stories at the campfire!!!
Brian R.
07-06-2004, 09:08 AM
Tough to troubleshoot without a CEL. Good job.
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