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10-29-2009, 04:03 PM
| #1 |
| Full Member Join Date: Oct 2009
Posts: 19
 | 98 k1500 won't start NEED HELP!!! Hi All, I'm new to the forum, so bare with me if I do something wrong. Here's the problem. I have a 98 1/2ton with 4.3L V6. 4 days ago the truck ran great no issues. Yesterday, I went to start the truck and no go. The motor cranks, batteries (2) are new and charged, just replaced the cap and rotor, verified good spark at cylinders 1, 3 and 5, just changed the fuel filter, verified good operation of the fuel pump, verified good fuel pressure, verifed injector assembly is working. I've gone so far as to put gas down the throttle body, still no go. Not even an attempt to go, you know cough cough sputter sputter. I'm at a loss |
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10-29-2009, 04:27 PM
| #2 |
| Senior Member  Join Date: Sep 2009 Location: MIchigan
Posts: 842
 | Have you tested the ICM? and i don't think the truck would have run with the intake tube off cause the ecm wasn't getting the right signal from the mass airflow sen. also i'd check the mass air flow for debris some times it get stuff stuck on it and that'll cause a no go and welcome |
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10-29-2009, 05:19 PM
| #3 |
| Full Member Join Date: Oct 2009
Posts: 19
| ICM appear to be working, there is good spark at cylinders 1, 3, 5. MAF I will check in the morning. Any other thoughts???  |
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10-29-2009, 05:24 PM
| #4 |
| Senior Member  Join Date: Apr 2009 Location: Arizona
Posts: 3,167
| How did you verify that the fuel injectors are working and how did you verify fuel pressure. did you use a Fuel pressure gauge? This is a vortec engine right? So it has a fuel rail right?
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10-29-2009, 05:26 PM
| #5 |
| Senior Member Join Date: Sep 2009 Location: MIchigan
Posts: 842
| one other question does the truck have a after market alarm? also the ignition switch in the cab may be bad it's kinda a bear to get to as it's in the steering column i think do you have any blow fuses in the under hood fuse block? If it is vortec it has CSFI 'six individual injectors located under the intake' the assembly kinda looks like a spider |
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10-29-2009, 05:28 PM
| #6 |
| Full Member Join Date: Oct 2009
Posts: 19
| fuel pressure was tested with a fuel pressure gauge. The injector assemble is a fuel meter body (central SFI). I have a Haynes repair manual. I followed the steps to test electrically the operation of the SFI |
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10-29-2009, 05:31 PM
| #7 |
| Full Member Join Date: Oct 2009
Posts: 19
| The only after marke equipement is a 2way radio. Why do you say the key switch? There appears to be power to the whole truck when cranking |
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10-29-2009, 05:32 PM
| #8 |
| Full Member Join Date: Oct 2009
Posts: 19
| I did check the fuses (all inside and out) and replaced one 30A fuse for AUX B |
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10-29-2009, 05:37 PM
| #9 |
| Senior Member Join Date: Sep 2009 Location: MIchigan
Posts: 842
| Yes it will have power but the ecm receives a signal from the switch letting it know that the proper key is in the ignition and will allow the truck to start and run. the switch just wears out over time |
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10-29-2009, 05:44 PM
| #10 | |
| Full Member Join Date: Oct 2009
Posts: 19
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