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1994 Chevy G20 van no start/stumble/stall
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markorock37
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Apr 28, 2009, 12:26 PM
Post #1 of 20
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1994 Chevy G20 van no start/stumble/stall
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Just bought a '94 G20 Chevy van with a 350 TBI, ran great a few days then started stalling at stops. It would start back up and run fine. Few days later it would start after it stalled then chug all the way home. Last time it was drove it was towed back home. So far I've replaced the plugs, cap, rotor, coolant temperature sensor, idle air control, tbi gasket. I've had it started a couple times but it just blows black smoke and backfired a few times. No codes, just code 12. Checked for spark and that is good. Fuel is spraying out like it should. Help, I'm stumped on this one!
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Tom Greenleaf
Ultimate Carjunky
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Apr 28, 2009, 9:27 PM
Post #2 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Just some ideas:
CTS sending total "cold" signal all the time - cheaper to replace it that to fuss with.
Fuel pressure inadequate. Check and leave tester on the rail. Should stay in spec and not lose it too quickly. Should show ok with just KOEO test. Injectors could be leaking down flooding out engine??
T
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markorock37
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Apr 30, 2009, 5:12 AM
Post #3 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Finally tripped a code 54 trying to start it - less than 2 volts at fuel pump corcuit...replaced fuel pump relay with no change. Can't hear the fuel pump kick on when the key is turned to run, thinking it may be fuel pump? Injectors were spraying good previuously but now are just at a small trickle after replacing the CTS. Could the fuel pump get proggressively worse within a week and just finally quit? I pulled out a plug and didn't look fouled to me.
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Tom Greenleaf
Ultimate Carjunky
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Apr 30, 2009, 5:34 AM
Post #4 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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That CTS (Coolant Temp Sensor) has issues with the connector as well. Dang things.
If you are now NOT hearing the fuel pump prime up build pressure which we need to know it could be the pump or if multwires oil pressure switch those can be the issue or the connection there as well. I think that is capable of disabling the fuel pump,
T
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markorock37
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Apr 30, 2009, 5:47 AM
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Re: 1994 Chevy G20 van no start/stumble/stall
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I already replaced the cts and connector which crumbled in my hand. Now it just wont start. Going to go check the oil pressure sender and I'll get back.
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Tom Greenleaf
Ultimate Carjunky
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Apr 30, 2009, 6:37 AM
Post #6 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Guessing and sorry about that: Try disconnecting battery, turn on headlights while is disconnected , go have a soda come back and hook it up.
Prime throttle body if needed and give it a run if that works - it's a wild maybe that it will self correct/relearn as it's called??
T
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markorock37
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Apr 30, 2009, 7:31 AM
Post #7 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Oil pressure switch and connection looks good and has 12v at connector. Disconnected battery for about 5 minutes, reconnected and poured a little gas in the tbi. Still no fire.
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Tom Greenleaf
Ultimate Carjunky
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Apr 30, 2009, 8:02 AM
Post #8 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Let's start over - no pun intended:
What does it do or not do right now? Fuel and fuel pressure OK? Spark or not?
How many miles on this engine? Can you can a cranking vacuum reading or better a couple cylinders for a compression #?
Something may be plain old wrong not just high tech junk,
T
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Hammer Time
Ultimate Carjunky
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Apr 30, 2009, 8:04 AM
Post #9 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Your trying to guess at things without any hard info. You need to use a fuel pressure gauge and a noid light to test for fuel pressure and injector pulse. That's the only way your going to know where your problem is coming from.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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markorock37
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Apr 30, 2009, 10:13 PM
Post #10 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Going to try and get my hands on a fuel pressure gauge. The engine has 180,000 on it, ran great before it started to stall. I knew the previous owner and it always ran great for him. Right now it will spray fuel pretty good for a few seconds then dies to a trickle. Seems to have good spark but it is orange if thats normal. I'll check the injectors in the morning. Thanks!
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Hammer Time
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May 1, 2009, 1:18 AM
Post #11 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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If you have one of the large chain parts stores in your area, most of them have a tool loaner or rental program where you should be able to get a fuel pressure gauge. The noid light costs less than $10
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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markorock37
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May 12, 2009, 10:02 PM
Post #12 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Injector pulse checked out fine. Engine wouldn't start with starting fluid. I think I have it isolated down to an ignition module or the hall effects sensor in the distributor. Coil seems to have a nice long spark when I tested it, but is very weak at the spark plug end. Tested the wires were under 6K. Any ideas? Engine still will not start at all.
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markorock37
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May 13, 2009, 7:21 AM
Post #14 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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I put new plugs in, gapped accordingly, changed the rotor and cap, and still not a single cylinder fire. Spark is almost nonexistent at end of plug wires. Wires look fine and ohm out ok. Enging will not start with starting fluid which leads me to believe it is either ignition or computer related. Initial symptoms were chugging, stalling so whatever it was has gotten worse. Van ran great for about a week when I first got it. One thing that is bothering me is I had to pry off the old rotor and had to use a block of wood and small hammer to get the new one on. I was careful while doing this, but is it possible I could have broken the hall effects sensor? I have a friend of mine thta has another whole distributor for same year/model I could swap out when he finds it.
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Hammer Time
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May 13, 2009, 7:46 AM
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Re: 1994 Chevy G20 van no start/stumble/stall
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No, again your on the wrong track if you have any spark at all. The pickup is a switching device that incidentally provides reference signal for the injector pulse also which you have no problem with so that is working. If you have spark but not enough, it's the coil you should be looking at.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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markorock37
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May 13, 2009, 10:18 AM
Post #16 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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That makes sense. Will be picking up a coil to see if thats it. Thanks
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markorock37
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May 14, 2009, 2:17 PM
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Re: 1994 Chevy G20 van no start/stumble/stall
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Ended up being the new plugs were carbon fouled because of a stuck open egr valve. Cleaned the plugs and disconnected the egr and runs fine now! I'll pick up an egr and this thing is done. Thanks
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Hammer Time
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May 14, 2009, 2:20 PM
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Re: 1994 Chevy G20 van no start/stumble/stall
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I don't tend to agree with blaming the EGR for that. I have never seen an EGR foul plugs.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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markorock37
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May 15, 2009, 8:24 AM
Post #19 of 20
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Re: 1994 Chevy G20 van no start/stumble/stall
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Anyway, the EGR will have to be replaced, drove around the block it was stuck wide open, even at idle. Thats a lot of exhaust gas at idle. Pulled a plug out this morning and looks good. Van is running SMOOOOTH.
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Hammer Time
Ultimate Carjunky
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May 15, 2009, 8:28 AM
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Re: 1994 Chevy G20 van no start/stumble/stall
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Yes, it will cause the idle to load up if it's stuck open. Just make sure you don't have it hooked to direct manifold vacuum. That would keep it open.
You can remove it and see if the pintle is stuck or now and you can even clean it if it is.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on May 15, 2009, 8:31 AM)
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