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confusing impala

 
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tatumboot
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2000 Chevrolet Impala


PostPosted: Mon Sep 12, 2011 10:47 pm    Post subject: Question confusing impala Reply with quote

i have a 2000 chevy impala ls 3.8. since i bought it it had been shutting out on me whilst driving, but i always wrote it off thinking that it was because i was playing my music loud ( i have two 12" speakers in the back )
it has gottenn to the point where it wont stay on at all, ill start it and it will die immediately after.
i put a scan tool on and i got a code for the crank sensor, replaced that and it idled fine and drove fine until later that evening, when the exact same thing happened again.
ive changed all of the spark plugs, replaced the fuel filter, and tried resetting the computer (pulled power from battery for 5 mins)
now that ive replaced that crank sensor the code has been reset for it and i have no check engine light and the car still won't start and stay on

oh yeah, it will stay on as long as i i throttle it and its at it's rev limit, once i release the gas it will just die on me, while im pushing the gas black smoke will b pouring out of my exhaust... any advice/help will be great
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Arvetus
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2001 Chevrolet Impala


PostPosted: Tue Sep 13, 2011 9:28 am    Post subject:   Reply with quote

Idle air control?

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tatumboot
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2000 Chevrolet Impala


PostPosted: Tue Sep 13, 2011 11:04 am    Post subject:   Reply with quote

took it out, cleaned it, cleaned the throttle bodies, air filter etc
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chibiblacksheep
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2000 Chevrolet Monte Carlo
2007 Chevrolet Impala
1968 Chevrolet Camaro
2013 Chevrolet Camaro


PostPosted: Tue Sep 13, 2011 11:23 am    Post subject:   Reply with quote

MAF and IAC going bad has those symptoms.

Just cleaning it doesn't rule it out.

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tatumboot
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2000 Chevrolet Impala


PostPosted: Tue Sep 13, 2011 11:24 am    Post subject:   Reply with quote

will replace and post results, if there is anything else i should try let me know
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Lingenfelter
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2003 Chevrolet Impala
1999 Yugo Tempo


PostPosted: Tue Sep 13, 2011 11:56 am    Post subject:   Reply with quote

Black smoke is unburned fuel...

Most likely either an air sensor (IAC/MAF) is bad, or you have a different combustion issue (fouled plug from excess fuel, maybe FPR is bad?).

I don't know how a plugged injector would affect the combustion cycle but I figure that would result in a CEL pretty quickly, which you're not reporting.

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chibiblacksheep
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2000 Chevrolet Monte Carlo
2007 Chevrolet Impala
1968 Chevrolet Camaro
2013 Chevrolet Camaro


PostPosted: Tue Sep 13, 2011 2:14 pm    Post subject:   Reply with quote

Lingenfelter wrote:
I don't know how a plugged injector would affect the combustion cycle but I figure that would result in a CEL pretty quickly, which you're not reporting.


Sometimes they leak and stream fuel out instead of spray and that causes a good amount of unburnt fuel.

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tatumboot
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PostPosted: Tue Sep 13, 2011 2:53 pm    Post subject:   Reply with quote

unplugged the MAF works like a charm
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billy101
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2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Tue Sep 13, 2011 2:53 pm    Post subject:   Reply with quote

chibiblacksheep wrote:
Lingenfelter wrote:
I don't know how a plugged injector would affect the combustion cycle but I figure that would result in a CEL pretty quickly, which you're not reporting.


Sometimes they leak and stream fuel out instead of spray and that causes a good amount of unburnt fuel.


That's what the problem was with my car. My MPG's dropped off a cliff, performance suffered, and black smoke from the tail pipe. We replaced the MAF and FPR to no avail. At 116k I guess the injectors got a bit dirty and injector #4 was leaking fuel constantly, which contributed to my hard re-starts because it flooded the cylinder with fuel. Took every fuel injector off and brought it to my dad's shop with a injector cleaner. They work perfectly now. so I wouldn't rule out a bad or leaking injector.

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2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
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