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mac3881
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May 14, 2016, 5:49 PM

Post #1 of 19 (716 views)
  post locked   needing help  

89 chevy s10 with a 2.5 5 speed i drove it in to the garage to change the clutch and flywheel did that now i dont get the fuel pump to run ive put in a new pump and ecm still nothing the old ecm was blowing fuses switched relay






(edit typo in subject line)


(This post was edited by Tom Greenleaf on May 16, 2016, 12:55 PM)


Discretesignals
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May 14, 2016, 6:40 PM

Post #2 of 19 (706 views)
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All this started after you did a clutch job? Which fuses were blowing?





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mac3881
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May 14, 2016, 6:43 PM

Post #3 of 19 (702 views)
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ecmb yes after


Discretesignals
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May 14, 2016, 6:47 PM

Post #4 of 19 (699 views)
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Have you inspected the harness that runs around and near the transmission and bell housing? Maybe you got one pinch or damaged an electrical harness. Do a really good visual inspection under there.





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mac3881
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May 14, 2016, 6:51 PM

Post #5 of 19 (694 views)
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yes ive checked the wires and the plugs that went on the t5 trans even checked the wires that run down the driver side of the frame


Discretesignals
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May 14, 2016, 7:08 PM

Post #6 of 19 (691 views)
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Never seen an ECM and fuel pump go bad right after a clutch job.

ECM B is used to protect the circuit for the fuel pump. Is that fuse still blowing? Did you install the same rating fuse(10 amp)? When you turn the ignition on, does the fuel pump relay click on for a few seconds and then click off?





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(This post was edited by Discretesignals on May 14, 2016, 7:10 PM)


mac3881
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May 14, 2016, 7:10 PM

Post #7 of 19 (686 views)
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its not blowing anymore and dont hear relay clicking


Discretesignals
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May 14, 2016, 7:11 PM

Post #8 of 19 (685 views)
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Using a 12 volt test light or volt meter do you have battery voltage at the ECM B fuse with the ignition on?





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mac3881
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May 14, 2016, 7:13 PM

Post #9 of 19 (681 views)
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i navent checked yet will do that monday as well put a new relay in


Discretesignals
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May 14, 2016, 7:16 PM

Post #10 of 19 (679 views)
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Why you installing parts? You haven't even figured out what is wrong. Where did you get the replacement ECM? ECMs don't go bad after you do a clutch job.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 14, 2016, 7:19 PM)


mac3881
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May 14, 2016, 7:18 PM

Post #11 of 19 (673 views)
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junk yard got it for 40 in case


Discretesignals
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May 14, 2016, 7:20 PM

Post #12 of 19 (672 views)
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When you turn the ignition on does the check engine light come on? Any trouble codes stored if the check engine light is working?





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(This post was edited by Discretesignals on May 14, 2016, 7:21 PM)


mac3881
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May 14, 2016, 7:21 PM

Post #13 of 19 (668 views)
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no and no code either


Discretesignals
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May 14, 2016, 7:32 PM

Post #14 of 19 (666 views)
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The ECM is supposed to turn the check engine light on for a bulb check when you turn the ignition on. Usually if it doesn't that means the ECM isn't working or the bulb is burned out. The ECM may not be working because it has no power, no ground, or is faulty. Maybe your salvage yard ECM is DOA. Do you still have the old one?

The ECM gets part of its power from the ECM B fuse which is hot all the time. The ECM will send power to the fuel pump relay to energize it. The ECM B fuse on the circuit also feeds power to the pump after the fuel pump relay is turned on. If the ECM turns on the relay and the fuse blows, part of the ECM goes dead and the fuel pump relay doesn't get any power.

What you should do is remove the fuel pump relay and then reinstall your old ECM. Turn the ignition on and see if the fuse blows and make sure the check engine light comes on and the ECM flashes 12. If the fuse doesn't blow it is probably blowing after the relay is turn on which means you have a short somewhere after the relay. Still have a gut feeling that wiring got damaged and shorted to ground during your clutch job.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 14, 2016, 7:35 PM)


mac3881
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May 14, 2016, 7:35 PM

Post #15 of 19 (659 views)
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yes i have the old one ok ill try that monday


Discretesignals
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May 14, 2016, 7:37 PM

Post #16 of 19 (658 views)
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Let us know what you find out. Make sure that you have a 10 amp fuse installed. If you put higher rated fuses in there, it may burn up wiring. The fuses are rated to protect the wiring.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 14, 2016, 7:38 PM)


mac3881
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May 14, 2016, 7:38 PM

Post #17 of 19 (654 views)
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i will


mac3881
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May 16, 2016, 12:26 PM

Post #18 of 19 (622 views)
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i fixed it it was a pinched wire it was under the cross member thanks for the help


Discretesignals
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May 16, 2016, 3:17 PM

Post #19 of 19 (612 views)
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Glad to read you got it figured out. Thanks for following up. Wink

Closed as solved. Can be reopened upon request by the OP.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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