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89 GMC 2500 runs but won't start by fastblack
Started on: 11-14-2012 11:04 AM
Replies: 5 (131 views)
Last post by: carnut122 on 12-09-2012 09:39 AM
fastblack
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Report this Post11-14-2012 11:04 AM Click Here to See the Profile for fastblackSend a Private Message to fastblackEdit/Delete MessageReply w/QuoteDirect Link to This Post
89 GMC 2500 5.7 liter fuel injected 5-speed

Sounds funny I know. My buddy's farm truck was having issues running a few weeks ago. He was saying it wouldn't run good or not start at all when it was wet or cold. He dug around a bit and I told him to replace the coil. Here's the thing, it used to crank over but not start, we replaced the coil but it still wouldn't start from cranking. We dug around a bit more and really were scratching our heads. Distributor cab and rotor are newish, that wasn't it. In between then and yesterday he told me that it stopped cranking when the key was turned but him and his dad "bump started" it and it ran perfect. Starter is NEW (not rebuilt) a year ago, plenty of power coming from a newish battery. Ignition module is also new.

Only thing we could think of was a bad clutch safety switch or an ignition switch? Thoughts? I told him to cross the wires on the clutch safety switch and try it but haven't heard back yet. Any help would be great!
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Monkeyman
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Report this Post11-15-2012 04:32 AM Click Here to See the Profile for MonkeymanSend a Private Message to MonkeymanEdit/Delete MessageReply w/QuoteDirect Link to This Post
Just because a starter is new, doesn't mean it's good. I've had bad starters right out of the box.
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fastblack
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Report this Post11-15-2012 10:51 AM Click Here to See the Profile for fastblackSend a Private Message to fastblackEdit/Delete MessageReply w/QuoteDirect Link to This Post
That is a possibility I suppose. I'll admit I'm a bit stumped, I'm betting it's something stupid. We have narrowed it down to spark so it is not a fuel or air problem. I'm beginning to think that after all the cranking he did trying to start it, he may have fried the starter.

Planning on tackling this thing again on Saturday as it is the first day either of us have the time. I suppose if I cross the connectors on the starter I'll be able to either take it out of the equation or call it one of the problems. I hope it's not the starter because if I recall correctly it was a pain in the butt to get out the first time.
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weaselbeak
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Report this Post11-16-2012 06:23 PM Click Here to See the Profile for weaselbeakClick Here to Email weaselbeakSend a Private Message to weaselbeakEdit/Delete MessageReply w/QuoteDirect Link to This Post
When the ignition switch is in crank mode it kills all other loads until you let off on the key. The radio goes dead, for example, while cranking. I have seen switches kill the ignition as well, so no start. The only job the starter has is to physically roll the motor over. If it will do that, you can rule out the starter and solenoid, clutch bypass, etc. You need fuel and fire. My 1st money is on a faulty switch that kills the ignition spark while cranking. Maybe the newer stuff is different, but this was quite common back in the 80's and 90's. You can run a wire direct from the battery to the lead, (battery terminal), on the HEI distributor cap to tell. That makes your distributor live, bypassing the switch, and anything else in the way.

[This message has been edited by weaselbeak (edited 11-16-2012).]

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fastblack
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Report this Post12-09-2012 12:52 AM Click Here to See the Profile for fastblackSend a Private Message to fastblackEdit/Delete MessageReply w/QuoteDirect Link to This Post
Well, revisiting this. Starter was indeed fried, got that replaced and the thing fired right up and ran perfect. Few days after that it started running rough again and then finally wouldn't start even when pull started.

The more I think of it, I really think it's the ignition switch. May try running a lead right to the distributor cap, sounds like a good idea.
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carnut122
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Report this Post12-09-2012 09:39 AM Click Here to See the Profile for carnut122Send a Private Message to carnut122Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Monkeyman:

Just because a starter is new, doesn't mean it's good. I've had bad starters right out of the box.


I just replaced one under that situation ^^^^^^^^^^^^^^^^^^^^^^^ in my Fiero. I went with a gear reduction starter for a bigger engine and haven't had an issue since.
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