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Registered
Join Date: Dec 2004
Location: texas
Posts: 455
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BAD surging problem
Today I put in a vacuum fitting i had been missing, the check valve on the fuel pressure regulator and damper. I EXPECTED the idle, which had been pretty uneven, to at least get a little more stable, but NOOO it couldn't be that simple
 As soon as I got on the highway I knew something was wrong. On 75% throttle, it ran like it was on 50% or less, and there was this noise from the exhaust like "bum bum bum bum", and the car was almost bouncing. When I got to where i could park (work) after a few minutes, I parked and put my hand behind the exhaust. with every audible "bump" there was a pulse in the exhaust stream. No need to worry, I'll just take the dern thing out! Of course, it still idled like it was, bumping and shaking the car. 4 hours later, on the way home, it did it again, with a more noticeable decrease in throttle response, and the throttle surged to its normal level every few seconds under 75%. When i took the old check valve out, the stem had broken off in the fuel regulator side's line, and while fishing it out i accidentally broke it up, but i had thought i had gotten it all out. Could it be clogging the regulator, or does the flow go in the opposite direction? thanks for reading my little story-- if you didn't, here's the gist: put in fuel regulator check valve, idle went screwy, car bounces and surges at more than 50% throttle, and throttle response is in the pisser.
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keep the dream alive! 1988 944 NA (purple) |
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07-28-2005, 07:44 PM
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Location: texas
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NO WAY IM EDITING THAT POST
Went out with my dad and fired it up again, put the valve on, goosed the throttle for a minute. Ran like normal  WHY though, why? Also noticed a ticking under the hood which sped up with the rpm's, by the P end of the cam cover. Lifter maybe?
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keep the dream alive! 1988 944 NA (purple) |
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07-28-2005, 08:37 PM
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Location: texas
Posts: 455
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post in here again!
idle is at 1200 rpm now, just chugging away happily. in addition to this i'm super pissed as I replaced the odometer gear today and the odometer still doesn't work. TAKING THE DASH OFF AGAIN TOMORROW however, i did put a brand spanking new guage cover/ lense on, and it made a huge difference in the brightness of the instrument lights. maybe it wasn't worth the cool $95 but it sure is nice.
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keep the dream alive! 1988 944 NA (purple) |
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07-29-2005, 01:51 PM
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Writer/Teacher
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car should be idling at just below 1000 (950 or so).
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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07-29-2005, 01:53 PM
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Registered
Join Date: Dec 2004
Location: texas
Posts: 455
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Quote:
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keep the dream alive! 1988 944 NA (purple) |
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07-29-2005, 02:03 PM
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You have to jumper the test plug B to C before you adjust the idle.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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07-29-2005, 02:15 PM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
1983 Porsche 944 2.5 liter
