opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-22-12 08:45 PM - Post#2194062
Wife was driving it today...of course. 
She said it just up and quit on her 4 times in 16 miles. Sitting here in the yard it quit on me 4 times, just idling. Just like you turned the key off. Ideas on where to start?
1/2 ton-350.
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fbi9c1
Frequent Contributor
Posts: 1656
Loc: Los Angeles
Reg: 08-07-07
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02-22-12 09:08 PM - Post#2194071
In response to opus
1) Fuel filter
2) ICM
3) Coil
4) Fuel pump
Check all of the above in that order. Good luck!
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-22-12 09:19 PM - Post#2194072
In response to fbi9c1
Yay...process of elimination! I'll be back if I have to diagnose anything that has an acronym.
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Mr_Shamrock
Forum Newbie
Posts: 57
Reg: 01-13-12
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02-23-12 06:22 AM - Post#2194153
In response to opus
You say "just like you turn the key off" does this mean you are actually losing all power like the key is off? If so, I would definitely start with the battery connections.
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-23-12 09:02 AM - Post#2194184
In response to Mr_Shamrock
No, no battery loss. Let me rephrase this then. Its just like you pull the coil wire. I will get a fuel filter and go with that first. I wold be very surprised if that were it, but its a start.
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355Cheyenne
Senior Member
Posts: 3743
Loc: Northern MN
Reg: 10-27-04
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02-23-12 12:14 PM - Post#2194257
In response to opus
pull the ignition module out and get it tested at a store. If they say it is bad then you found the problem, if they say it is good buy a new one anyway.
| 98 Silverado k1500 4x4 350 |
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-23-12 12:49 PM - Post#2194275
In response to 355Cheyenne
Ok, I'm a points kinda guy. Can you point me to it and what it looks like. 
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daustin
Contributor
Posts: 298
Age: 53
Loc: Woodstock, Ga
Reg: 12-03-08
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02-23-12 01:18 PM - Post#2194287
In response to opus
The ignition module sits where the points used to sit. Unplug the 2 connectors, and there's 2 screws to take it out. Common problem, if you replace it use the grease that comes with it or it will burn out fairly quickly. If it dosen't come with the grease, that box has been opened - get another.
Don
1957 210 2d Post
1961 Bubbletop Impala
1965 Buick LeSabre
1968 327 Camaro
1968 427 COPO Corvette
1984 Monte Carlo SS
1969 RS Camaro
1969 GTO
1976 Camaro
1993 Silverado 3500 Dually 6.5TD
1993 GMC 1500
1994 9C1 Caprice
1997 Silverado 1500 |
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-23-12 01:21 PM - Post#2194289
In response to daustin
Got it, thank you.
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-24-12 12:31 PM - Post#2194719
In response to opus
Had the ICM tested, its good. There was no paste on the bottom of it at all, not sure that would be it though. Fuel filter coming up...........
Any way to test the coil?
Edited by opus on 02-24-12 12:31 PM. Reason for edit: No reason given.
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 12:39 PM - Post#2194721
In response to opus
put a test light on the tach lead its the free lead off the ignition coil. ground the light. turn your key to crank it and look for a light pulse when cranking. if you see it pulsing when the motor is cranking your coil is most likely ok move on to the ICM under the distributor cap you can get one from the wreckers for 20 bucks. swap it out. it will take all of 10 min.
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 12:42 PM - Post#2194723
In response to opus
you need thermal paste under your ICU its important!the bugger heats up and burns out
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-24-12 12:43 PM - Post#2194725
In response to 350whip
I put paste on it and re-installed it.
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 12:53 PM - Post#2194731
In response to opus
switch it anyway. 20 bucks wreckers. then pry off the little cover look at the chip inside i bet you its cooked man. you cant test that little guy off the truck so if someone has told you otherwise its hogwash.
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 12:54 PM - Post#2194734
In response to opus
lol i keep a spare ICU in my truck at all times its cheaper than a tow lol
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 01:30 PM - Post#2194744
In response to 355Cheyenne
lol don't we all have 3 or 4 ICM's bloody 350tbi is so bad at cooking them i have been through 3 in 10 years. last time i did'nt check anything i just put in a coil and ICM right on the side of the road fired right up
89Chev 350tbi 4x4 (the ICM killa)
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 02:14 PM - Post#2194758
In response to daustin
3 connecters the 2 on the back and the one inside the distributor cap connecting the pickup coil. to the (ICM or ignition control module).
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-24-12 03:31 PM - Post#2194784
In response to 350whip
No junk yards around for 150 miles. NAPA tested it twice and they said it was fine.
I changed the fuel filter....that was fun. I am going to go with the fuel filter from the looks of things. Odd, I dont ever remember changing it yet I am anal about these things. I think I have too many rigs.
I'll drive it this weekend and see. It hasnt stalled yet.
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-24-12 03:41 PM - Post#2194791
In response to opus
ok cool man let us know, but i have had 2 so called good ICM's and both times after i switched it out the problems went away. if the fuel filter don't do it and you trust the ICM you can try the pickup coil ontop of the distributor plate. if that is'nt it swap out the distributor. these old trucks are dead simple. go OEM no performance crap it is often over rated.
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-24-12 03:48 PM - Post#2194797
In response to 350whip
No performance stuff for me. Heck, I see I can get an ICM on Ebay for $15. I might do that just to have a spare. I'll keep you posted.
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fbi9c1
Frequent Contributor
Posts: 1656
Loc: Los Angeles
Reg: 08-07-07
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02-24-12 08:30 PM - Post#2194887
In response to opus
Glad you got it going! I don't think you will have further problems, but let us know.
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-26-12 02:36 PM - Post#2195519
In response to fbi9c1
Ugh, its dead. I idled it for 15 min, no problem. This morning she headed out and got a mile down the road and it died 3 times. Limped it home and now its totally dead. I am thinking fuel pump but wont be back home til tomorrow night to check it out. I pulled the gas filter and let the frame rail stop dripping. I think hopped in and put it in neutral to back it out of the gas on the ground. Silly me, I turned the key on and the pump fired and gas went all over. Obviously the pump wasnt dead then.
Best way to check the pump is??
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wood restorer
Forum Newbie
Posts: 78
Reg: 01-07-10
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02-26-12 08:31 PM - Post#2195676
In response to opus
http://www.chevytalk.org/fusionbb/showtopic.php?ti... from the faq sec. these pumps may still work some just not put out enough pressure to run things.
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-26-12 09:08 PM - Post#2195688
In response to wood restorer
OK, got it. The fuel pump is in the gas tank? Whos idea was that??
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355Cheyenne
Senior Member
Posts: 3743
Loc: Northern MN
Reg: 10-27-04
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02-26-12 09:13 PM - Post#2195690
In response to opus
OK, got it. The fuel pump is in the gas tank? Whos idea was that??
When it dies does it fire right back up again w/ any trouble or does it put up a fight to get started again? and when started again does it run fine until it dies again?
| 98 Silverado k1500 4x4 350 |
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-26-12 09:23 PM - Post#2195695
In response to 355Cheyenne
When it dies does it fire right back up again w/ any trouble or does it put up a fight to get started again? and when started again does it run fine until it dies again?
The other day, it would die, then start and idle fine...then die. Today, I couldnt get it to start again. When I changed the fuel filter the other day, of course the thing drained gas for ever. No need to crack a line and bleed air like a diesel, right? I'm not up on TBI operation.
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355Cheyenne
Senior Member
Posts: 3743
Loc: Northern MN
Reg: 10-27-04
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02-26-12 09:34 PM - Post#2195699
In response to opus
No need to bleed air out that is not your problem at all. You know it could be a bad fuel pump. I have seen pumps that would intermittently work and not work until they finally don't work at all. Sometimes a smack to the tank would bring them back to life for a little while. But if I were in your shoes I would just drop the money on a coolant temp sensor and an ignition module. I know the store said ti was good but I would change it anyway. I say this because they are a lot easier and cheaper to change and more likely to be the culprit...
I have done fuel pumps in these trucks many times and I would rather waste my time on some other hope. I guess it isn't that bad a job but  that is just me.
| 98 Silverado k1500 4x4 350 |
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opus
Member
Posts: 95
Loc: Montana
Reg: 10-20-04
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02-26-12 09:38 PM - Post#2195702
In response to 355Cheyenne
No need to bleed air out that is not your problem at all. You know it could be a bad fuel pump. I have seen pumps that would intermittently work and not work until they finally don't work at all. Sometimes a smack to the tank would bring them back to life for a little while. But if I were in your shoes I would just drop the money on a coolant temp sensor and an ignition module. I know the store said ti was good but I would change it anyway. I say this because they are a lot easier and cheaper to change and more likely to be the culprit...
I have done fuel pumps in these trucks many times and I would rather waste my time on some other hope. I guess it isn't that bad a job but that is just me.
Coolant temp sensor? Whatever would that have to do with it? Ok, I will get a new ICM. They tested it twice and said good but if you think I should....
Is there a particular reason why you couldn't have an external fuel pump? Just curious. I would have the job done, I aint going to get involved with that.
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355Cheyenne
Senior Member
Posts: 3743
Loc: Northern MN
Reg: 10-27-04
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02-26-12 09:41 PM - Post#2195706
In response to opus
Very common with these trucks is to have a faulty CTS (coolant temp sensor) which is the one next to the thermostat housing that tells the ECU what the engine temp is (not the one on driver side head that is for the dash gauge) and this sensor when faulty tells the ECU that it is way colder than it actually is (like -30) and so the ecu floods the motor with to much fuel and so the motor randomly dies and runs like crap as it warms up and goes into closed loop.
| 98 Silverado k1500 4x4 350 |
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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02-27-12 05:38 AM - Post#2195765
In response to opus
Lol I wish fuel pumps where in line too. ICM. Plugs wires distributer cap, rotor. Clean your IAC. If it still runs like crap vacuum test. If your needle bounces you have something mechanically wrong. Or a leak pull off a vac line just blow smoke in it see where it comes out. Trailer park auto repair lol
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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