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Author Topic: Gm 5.7 issue.  (Read 1554 times)

Offline Zach Holt

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Gm 5.7 issue.
« on: April 09, 2015, 08:06:45 pm »
Ok my daily driving out here in butt fuck no where Saskatchewan is acting up.

94 Gm 5.7, it will start run nicely then out of no where or when it's cold almost shut off like rpm drops from 2200 to 1500 to 1800 jumping back and forth then back fire and run fine for a wile normaly and do it again. I did the plugs wires cap and rotor and now it just does it smoother.

At a loss. Any ideas?
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Offline Ivan Skare

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Re: Gm 5.7 issue.
« Reply #1 on: April 09, 2015, 08:35:30 pm »
Sounds like a mass air flow sensor problem.
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Offline Marke Bailey

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Re: Gm 5.7 issue.
« Reply #2 on: April 10, 2015, 10:08:04 am »
Check o2 sensor?
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Offline Brett Haviland

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Re: Gm 5.7 issue.
« Reply #3 on: April 10, 2015, 01:14:51 pm »
scrap it.  Worth more that way, and more usefull.

Sorry, im a ford guy ;)
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Offline Marke Bailey

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Re: Gm 5.7 issue.
« Reply #4 on: April 10, 2015, 04:43:00 pm »
Minus points for Brett being a Ford guy.:-P
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Offline Dave Ingraham

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Re: Gm 5.7 issue.
« Reply #5 on: April 11, 2015, 10:07:05 am »
I have seen pick-up coils and ign modules do shit like that. 
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Offline Brett Haviland

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Re: Gm 5.7 issue.
« Reply #6 on: April 12, 2015, 01:36:44 am »
lol I told Zach to replace the coil, and try a ignition module 2 months ago!  ;)  could be pick up coil as well, but id try the coil/module/pick up in that order.
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Offline Zach Holt

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Re: Gm 5.7 issue.
« Reply #7 on: April 17, 2015, 05:52:58 pm »
Coil down! Ass balls the truck runs like a fat kid after an Icecream truck... It can idle but then rev her and she shits her self.
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Offline John Hartman

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Re: Gm 5.7 issue.
« Reply #8 on: May 02, 2015, 10:41:42 pm »
still a problem or you figure it out?
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Offline Zach Holt

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Re: Gm 5.7 issue.
« Reply #9 on: May 05, 2015, 03:47:57 pm »
Nope did coil cap rotor plugs wires nothing. Gave up had it towed for a tune up.
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http://en.wikipedia.org/wiki/Mitsubishi
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Then read old postings about it.
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Offline John Hartman

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Re: Gm 5.7 issue.
« Reply #10 on: May 05, 2015, 04:04:54 pm »
did they fix it?  it could be a number of things, but two come to my mind.

it could be a fuel system related problem.  Those years could come with a certain type of port injection that isn't really port injection.  it has a "spider" system of plastic tubes in the intake manifold runners with plastic injectors.  Often times the fuel pressure regulator fails and leaks. The leak dumps raw fuel down the intake manifold.  The "spiders" themselves often just plain fail as well, as its a really crappy system.

the other thing to look at is the timing chain or distributor drive gear.  If you are getting backfires and intermittent lacks of performance, the timing can be jumping around.  If the distributor drive gear is worn off, this will  happen.  If the timing chain is stretched, and/or the chain guides (or other parts) are worn, this will also happen.
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91 Eagle Talon TSi 5spd awd.  GT-12, TriFlow Cams, 850s, Tial, JIC, Jackal, sticky rubber.
86 Merkur XR4Ti 5spd, rwd, turbo, 91,381km.  Original paint, heated leather. intercooled, big VAM, Full 3" exhaust, Cossie sway bar, 16" tires.
06 Mazdaspeed6 6spd awd, DISI turbo, heated leather HIDs, Corksport, Cobb, Konig, Centric...
2018 VW Golf Alltrack turbo Tornado Red, 6mt, some free mods

Offline Zach Holt

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Re: Gm 5.7 issue.
« Reply #11 on: June 22, 2015, 09:13:03 pm »
Changed every damn thing. Then I did the ecu ran like a dream
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http://en.wikipedia.org/wiki/Mitsubishi
Then google.
Then read old postings about it.
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Offline John Hartman

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Re: Gm 5.7 issue.
« Reply #12 on: June 22, 2015, 10:39:34 pm »
fuck it.  put a 12v Cummins in it
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91 Eagle Talon TSi 5spd awd.  GT-12, TriFlow Cams, 850s, Tial, JIC, Jackal, sticky rubber.
86 Merkur XR4Ti 5spd, rwd, turbo, 91,381km.  Original paint, heated leather. intercooled, big VAM, Full 3" exhaust, Cossie sway bar, 16" tires.
06 Mazdaspeed6 6spd awd, DISI turbo, heated leather HIDs, Corksport, Cobb, Konig, Centric...
2018 VW Golf Alltrack turbo Tornado Red, 6mt, some free mods
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