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Post by dennismopar73 on Nov 14, 2011 19:06:43 GMT -5
check fuel return hose could be clogged it happened to me run like shit smelled raw fuel check engine light comes on and would die took it to the dealer.The dealer said it was the return line. I forgot about that , could also be emission canister is getting fuel in it as well then sucks excessive fuel up the vacuum lines? |
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Post by woodsfamilyracing on Nov 14, 2011 20:17:34 GMT -5
Check for backpressure at the cat. That will also throw a MAP code
Keith
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Post by blackandblueracing on Nov 15, 2011 19:07:52 GMT -5
Fuel return is good, and it doesnt run liks shit, it wont idle. It runs like a bat out of hell. As soon as you crack it above idle its fine. I guess its time to take it to a Chevy dealer and see what they can find. When the EGR was replaced, it wasnt full of carbon,the gasket was leaking so I put a one one while it was apart, plus an EGR wont make it run rich at idle. The first shop I took it to tested all the electrcal connections. Pulled lines off canister, no sign of fuel, ande if cat was block it wouldnt smoke the tire and leave 10 foot of rubber when it hits second. Ive had a blocked convertor before and they lose power at higher RPM because it cant exit. I have great power as soon as its above idle till it shifts. Im stumpped, as much as I dont want to pay GM mechanics price, looks like its time I have to.
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Post by bigjosh on Nov 16, 2011 7:15:22 GMT -5
where u from? im in warrenton
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Post by bigblocknotch on Nov 16, 2011 14:33:08 GMT -5
If that is a vortec 4.3, they are bad about getting a chunck of carbon stuck in the EGR valve, allowing it to suck exhast gas. Yes, that WILL cause a rough idle. Easy to check, just pull the valve off and look. They make a gasket with a screen on it just for that condition. Disregard if it already has the screen gasket.
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Post by blackandblueracing on Nov 16, 2011 19:06:59 GMT -5
bigjosh, Im in Wright City in Greenfeild.
bigblocknotch, I know a bad EGR will cause a rough idle, it WONT cause a RICH idle that is my problem. Im getting way to much fuel at idle. The EGR was put on in August. It wasnt carboned up then I doubt it is now. So can we please forget the EGR, since it wont cause a rich idle. Plus its not a vortec,
I will be taking it to a Chevy dealer, everything that has been suggested Ive already done, twice. I thought maybe I was missing something but it seems not. I cant think of anything else and its been a month now, and I need it fixed so I guess its time to just take it to the dealer. Thanks
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Post by bigjosh on Nov 17, 2011 5:21:17 GMT -5
i would like to look at it befor u do that
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Post by slingshot383 on Nov 17, 2011 5:22:43 GMT -5
Sounds like the injectors won't seal during off cycle.
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Post by bigjosh on Nov 17, 2011 17:00:35 GMT -5
i bet one is not working or just dumping fuel
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Post by sg3526 on Nov 17, 2011 18:31:59 GMT -5
i bet one is not working or just dumping fuel I believe it's Throttle Body, but they can still hang open. He said that he replaced them and almost everything else that has something to do with it. I'm placing my money on something in the MAF circuit, like clogged or bad wiring. |
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Post by blackandblueracing on Nov 17, 2011 18:50:02 GMT -5
sg3526, Ive replacded the throttle body, no change, One new injector, no change, put it in both positions, no change. Replaced the injector/regulator assembly from a unit I know was good, no change. I am getting fuel return, injectors are working, just too much.
And its an 89 non vortec, no MAF
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Post by sg3526 on Nov 17, 2011 23:24:37 GMT -5
sg3526, Ive replacded the throttle body, no change, One new injector, no change, put it in both positions, no change. Replaced the injector/regulator assembly from a unit I know was good, no change. I am getting fuel return, injectors are working, just too much. And its an 89 non vortec, no MAF My bad. Meant MAP Sensor |
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Post by bracketracing on Nov 18, 2011 10:08:06 GMT -5
You've tried almost everything. Need to read scan data to check coolant temp ect. Check dist shaft if magnets are not good it will run great but not idle. I've seen many on 5.7 tbi
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Post by blackandblueracing on Nov 19, 2011 13:55:38 GMT -5
bigjosh came by with a computor reader and and couldnt find it, coolant temp is 200, new coolant temp sensor. Distributor magnets wont make it run rich. Everyone dwells on the rough idle. its a RICH idle causing the rough idle. Lots of things will cause a rough idle, I know that. That is the result of my problem, too much fuel is whats causing it. It loads up at idle, if I unplug one injector it idles smooth. So its not the distributor, EGR, MAP, I have replaced everything. bigjosh can give info on what he read from his scanner.
bigjosh, thanks again for stopping by and checking it. i was hoping it would be something I might have overlooked. The dealers shop isnt open on Saturday so now Im not sure when Ill be able to get it there.
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gdog
Full Member
Posts: 198
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Post by gdog on Nov 19, 2011 17:49:52 GMT -5
After doing some research and talking with some folks I think you will find the engine computer took a crap on you. The way to find out is to put a scanner on it and measure the injector pulse width at idle you may find it to be high 3.5+msec when it should be 1.5 or 1.6msec the indication is the running ok or almost ok with one injector killed the injector driver section of the cpu must have gone stupid as you have checked and corrected everything but the problem easy to verify with scanner tool. Gene
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