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| no power to TBI | |
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| Tweet Topic Started: Jan 31 2010, 10:56 PM (1,324 Views) | |
| supergeo | Jan 31 2010, 10:56 PM Post #1 |
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Fresh Fish
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Hi all, My 1990 metro 1L quit working.I was in a trafic and it stopped.There was a spark,but no gas going in.I put some gas directly under the air filter and the motor started.I had same problem 2-3 times until got home.When I pour a little gas in it works for a while.I disconnected gas supply and return hoses to check the fuel pump-it works.Took off the injector and tested it with 12V -it works,but no power is coming to.Any ideas,guys?I could not see bad wires,but I'd like to check them out for a bad connection.Do those yellow wires come from the pump relay and ECM? Everything would be helpfull.Thanks in advance. |
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| Johnny Mullet | Jan 31 2010, 11:03 PM Post #2 |
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Fear the Mullet
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Check all the fuses under the hood? |
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| supergeo | Jan 31 2010, 11:15 PM Post #3 |
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Fresh Fish
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Yes.All of them. |
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| Bad Bent | Feb 1 2010, 12:20 AM Post #4 |
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Facetious Educated Donkey
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Welcome to the forum, supergeo! Check out post #21 here; My latest Project. mwebb's testing of an injector. Also click; Connections with a "T" pin. And TBi injector waveforms. |
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| supergeo | Feb 1 2010, 11:10 PM Post #5 |
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Fresh Fish
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It's workiiing.What did I do?(1)Took off the fuel pump relay,because I wanted to check the connection to the injector-the wire was OK.(2)Took off the ECM,found the wire that goes to the injector and checked for power at the ECM-yes there was a power 12V coming and checked for same at TBI.First I had only coming from the relay,but then with the ign.switch on got 12V to both of the wires at the injector.With the switch on I disconnected the ground from the battery and many times put it on -off,so I was able to watch what happens in the throat.The injector did pop and I smelled gas.Went in the car and started the engine.It was working not good on 2cyl.1 spark plug was out.Put the old ones that I still keep.No more fake "Autolite"-a few months old and that's it.BTW next is a good one.That black plastic vacuum filter on the back side of the air filter pan was pluged with a screw inside that peace of 1 1/2" long hose.I didn't pass the emission test 4-5 months ago.The lady I bought the car from was complaining from her mechanics-neighbours. I still don't know what exactly was wrong with the car and hope that won't happen again.Thanks everybody and
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| bogs | Feb 2 2010, 12:22 PM Post #6 |
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Duct tape heals all wounds
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Good deal, happy ending
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| mwebb | Feb 2 2010, 12:42 PM Post #7 |
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FOG
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i have seen this before you inadvertently repaired a corroded connection by disconnecting then reconnecting a connector probably at the ECM , but who knows the problem may return , or not , depending on things beyond your control i use either stabilant22a or Wurth contact OL on suspected slightly dirty / corroded connections to attempt to prevent a re occurrence of the original poor connection sometimes the female connectors in the ECM harness loose their ability to tightly grip the male connectors ..... which mimics the problem as well . it took me ,with my tooling and experience about 3 hours to find one of those a few weeks ago on a astro van , an female connection at an injector driver pin at the new PCM installed by another shop , was a bit loose . if the problem returns you will need to isolate the actual pin that is causing the symptom |
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| metroschultz | Feb 2 2010, 12:47 PM Post #8 |
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Please just call me; "Schultz"
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I agree MWebb, probably cleaned a connector by disconnecting/reconnecting. I vote for the relay though. Time will tell. |
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| supergeo | Feb 2 2010, 08:57 PM Post #9 |
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Fresh Fish
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Yesterday I drove the car to a store for 1 mile and back.It was ok.BUT early this morning when I was going to work- .-almost .Lost power,poping in the throat,but it didn't quit and I got work.Worked good before I turn it off.After work to home-no problems at all.I opened the hood with engine working and moved,disconnected,connected back some wires and saw a spark.Those 2 wires that come from the ign.module and go to the ign.coil.One of them had a hurt insulation and touched the engine block.Left the engine working for 1 1/2 hour,then drove it and looked fine.Will see tomorrow!
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| mwebb | Feb 2 2010, 11:18 PM Post #10 |
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FOG
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you may have more than one problem see any mouse droppings or nesting materials ? ![]() right click on image - select view image - click 2x to expand image blue and black injector signal and injector current at WOT snap with spark synced on cyl 1 this is a bad injector - but you can not tell form this waveform shown this waveform under these conditions at this resolution appears as a good injector waveform. but it is not Edited by mwebb, Feb 2 2010, 11:22 PM.
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It's workiiing.What did I do?(1)Took off the fuel pump relay,because I wanted to check the connection to the injector-the wire was OK.(2)Took off the ECM,found the wire that goes to the injector and checked for power at the ECM-yes there was a power 12V coming and checked for same at TBI.First I had only coming from the relay,but then with the ign.switch on got 12V to both of the wires at the injector.With the switch on I disconnected the ground from the battery and many times put it on -off,so I was able to watch what happens in the throat.The injector did pop and I smelled gas.Went in the car and started the engine.It was working not good on 2cyl.1 spark plug was out.Put the old ones that I still keep.No more fake "Autolite"-a few months old and that's it.
and hope that won't happen again.

.-almost
.Lost power,poping in the throat,but it didn't quit and I got work.Worked good before I turn it off.After work to home-no problems at all.I opened the hood with engine working and moved,disconnected,connected back some wires and saw a spark.Those 2 wires that come from the ign.module and go to the ign.coil.One of them had a hurt insulation and touched the engine block.Left the engine working for 1 1/2 hour,then drove it and looked fine.Will see tomorrow!

1:54 PM Jul 11