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loss of power

 
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spankthaspeedbump
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2001 Chevrolet Impala


PostPosted: Sat May 03, 2014 8:00 pm    Post subject:  loss of power Reply with quote

Hey guys, before I throw more money at this issue lemme ask first.

Ok, so it's an 04 SS Indy, 138k on it. Brand new tranny installed at 100k. It'll smoke the tires no problem, it shifts nice an smooth during normal cruising

Here's the problem, under hard acceleration around half to 3/4 throttle it'll completely drop off the power for half a second and jump back up. And feathering the throttle doesn't seem to get it to kick back in faster. No check engine light no odd noises. So my first thought was TPS, $70 later and 5 minute install later... Didn't change anything.

So now I'm thinking, my boost gauge doesn't work. So maybe the pcm doesn't know my boost level either. but I thought the boost was measured by the MAF such was just replaced. But on O'rileys I can buy a boost sensor separate. Does this theory sound plausible?

Idea #2, the fuel filter was just replaced so it shouldn't be clogged, maybe the fuel pump is weak? But when the power kicks back up, it seems to be full strength.

So that's what I got, I'll be checking the fuel pressure tomorrow, but lemme know if you guys have any ideas. Thanks much.

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98ss
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2002 Chevrolet Impala
2011 Chevrolet Silverado


PostPosted: Sat May 03, 2014 9:51 pm    Post subject:   Reply with quote

If the fuel pump is not putting out enough fuel then it should be running lean for a bit, that would show up in the knock sensor, or knock retard.
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spankthaspeedbump
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2001 Chevrolet Impala


PostPosted: Sat May 03, 2014 9:54 pm    Post subject:   Reply with quote

Ok, I'll hook it up tomorrow. I don't think it's the fuel pump though.

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Irish_alley
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2004 Chevrolet Impala
1986 GMC Sierra
1994 Chevrolet Silverado
1984 GMC Sierra
1979 Chevrolet Silverado
1991 Chevrolet Silverado


PostPosted: Sun May 04, 2014 12:17 am    Post subject:   Reply with quote

you didnt test drive the car before you bought it?

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spankthaspeedbump
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2001 Chevrolet Impala


PostPosted: Sun May 04, 2014 12:38 am    Post subject:   Reply with quote

Well naturally it didn't do anything concerning during the test drive! Lol this is just how my life works out.

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spankthaspeedbump
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2001 Chevrolet Impala


PostPosted: Mon May 05, 2014 2:07 pm    Post subject:   Reply with quote

Ok, so I've got a MAF sensor circuit low code I've heard that the MAF and speed sensor tie together. The speed sensor is not reading correctly, at 35 it reads 65 on the scan tool, and 65 is reading up around 110. Could this be causing my code? The MAF sensor was just recently replaced, and it ain't cheap so I really don't want to buy another one and hope for the best.

Thanks.

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spankthaspeedbump
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2001 Chevrolet Impala


PostPosted: Wed May 07, 2014 3:01 am    Post subject:   Reply with quote

Ok guys, got it figured out. It was the MAF sensor. Which sucks cuz it's brand new. So I took the sensor out of the 01 with a blown motor. The SS runs like a dream now!

Thanks anyone that tried to help!

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