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 '96 P0171, hard shifts

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Northeast
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PostSubject: '96 P0171, hard shifts   Thu Oct 27, 2011 6:51 pm

96 throwing a p0171 code. No misfires currently. New MAF (getting the SES before it was replaced). When the car first starts, it shifts harder than normal, almost seems like it has more low end torque than before the SES-the throttle is very touchy. Doesn't seem like a vacume leak, at least I cannot find one. All the lines were replaced last summer with silicone. There were no new changes or anything done resently that might trigger this code. Was driving one day and the car stalled....drove a few miles and got p0171, p0172, p0300. Cleared the codes, now just get p0171 after 20 mins of driving consistently. Any ides that might help me?
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Mr.Riviera
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PostSubject: Re: '96 P0171, hard shifts   Thu Oct 27, 2011 6:56 pm

sounds like you may have a break in the wire for the MAF sensor. It seems to be a pretty common wire to break right at the firewall.

When you unplug the maf and run the car does the car behave differently?
do you have access to a scan tool to read the MAF hz?

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1996 with 244k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: '96 P0171, hard shifts   Thu Oct 27, 2011 7:15 pm

I have an aeroforce, not sure if this is the measurement you meant.


MAF FREQUENCY-reads 2500 - 2800 at idle.

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Northeast
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PostSubject: Re: '96 P0171, hard shifts   Fri Oct 28, 2011 3:06 pm

just pulled p0171 AND p0172 (rich and lean)
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Mr.Riviera
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PostSubject: Re: '96 P0171, hard shifts   Fri Oct 28, 2011 10:21 pm

sounds like the computer isnt reading the MAF right.

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1996 with 244k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: '96 P0171, hard shifts   Sat Oct 29, 2011 12:39 pm

I originally was thinking the MAF, but the readings seem ok, flow lbs, etc (also was behaving the same way before the new MAF, p0171 and p0172)
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PostSubject: Re: '96 P0171, hard shifts   Mon Nov 28, 2011 8:41 pm

So I solved the issue. It was the 5 month old ZZP fuel rail. I was pulling p0171 and p0172 codes. Went back to the OEM rail and it runs fine now.
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PostSubject: Re: '96 P0171, hard shifts   Mon Nov 28, 2011 8:52 pm

Which type of rail is it, and does anything appear wrong with the rail?

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
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