hesitation
Thread Starter
Track Day
Joined: Jan 2012
Posts: 24
Likes: 1
From: Key West
hesitation
In the am, when I start my car, she will start up and idle perfectly, but when I step on the gas, she will bog down, I can hear a slight popping in the engine compartment. If you keep your foot on the throttle, she will stall out. But if you feather the gas until you can move the idle up to around 2500 or 3000 the hesitation and bogging goes away and doesnt come back until you try to start the car. It happens only at initial start up.
Symptoms - bogging down at start up under throttle. slight backfire, hesitation, no check engine light
Parts already replaced - fuel pump, fuel filter, spark plugs,
Aftermarket parts - Headers, K&N cold air kit
Work done - removed and cleaned throttle body, replaced plugs, fuel filter, fuel pump
Any suggestions?
Symptoms - bogging down at start up under throttle. slight backfire, hesitation, no check engine light
Parts already replaced - fuel pump, fuel filter, spark plugs,
Aftermarket parts - Headers, K&N cold air kit
Work done - removed and cleaned throttle body, replaced plugs, fuel filter, fuel pump
Any suggestions?
Drifting
Joined: Oct 2011
Posts: 3,217
Likes: 14
From: Texas
Jzzzake, just an observation but it would be helpful if you would post your car info, year, mileage, etc. I assume its some type of 996 or you wouldnt be here. It has a fuel filter you replaced so pre 2002? But, you also say fuel pump so who knows what year you have? Who did the work? When? Symptoms before work done? Stored code(s), may not show CEL?
From what you posted, my WAG is:
1.coil packs
2.other ignition problem
3.injector (doubtful)
4.MAF (more doubtful)
5.AOS (unlikely)
And, also IMHO, the K&N is a red flag, headers another red flag. Oops. Forgot, check for vacuum leaks too.
From what you posted, my WAG is:
1.coil packs
2.other ignition problem
3.injector (doubtful)
4.MAF (more doubtful)
5.AOS (unlikely)
And, also IMHO, the K&N is a red flag, headers another red flag. Oops. Forgot, check for vacuum leaks too.
Last edited by KrazyK; Jan 13, 2013 at 01:36 AM.
Drifting
Joined: Sep 2011
Posts: 3,086
Likes: 27
From: Ephrata, PA, USA now. Originally from the UK
Backfire? Doesn't that indicate a wrong air/fuel mixture? Or maybe the timing is out somehow? Now I have no idea what controls those symtoms on these More modern cars but I could solve it on the old beetles in a flash haha. Then again altering the original to Aftermarket parts - Headers, K&N cold air kit, may effect the performance of the engine. Hell I don't know so I had best shut up. Hope you solve the problem. Are you using the top grade fuel?
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Racer
Joined: Aug 2009
Posts: 380
Likes: 0
How cold is the temp outside? My car will pull back also as I pull out of the driveway when it's cold outside. When it does I back off the throttle and its dime. Do not rev a cold engine in past 2500-3000 rpm's until the temp gauge gets up to the the 1st line on the gauge. I don't know what year your 911 is but mine is a 99 that first went into service in May of 1998. I go easy on it until the temp is up and then drive it normal. It's a teenager and I am determined to keep it for 6 more years, it will then be a 20 year old car.
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Thread Starter
Track Day
Joined: Jan 2012
Posts: 24
Likes: 1
From: Key West
The car is a 1999 C2. I live in Key West so the mornings are never less than 65 degrees. I did the work myself, as I own a shop here,there are no stored codes, no CEL, always run the best gas, cats and O2 sensors are still there, air pump comes on at start, MAF working prfectly.
Drifting
Joined: Sep 2011
Posts: 3,086
Likes: 27
From: Ephrata, PA, USA now. Originally from the UK
How cold is the temp outside? My car will pull back also as I pull out of the driveway when it's cold outside. When it does I back off the throttle and its dime. Do not rev a cold engine in past 2500-3000 rpm's until the temp gauge gets up to the the 1st line on the gauge. I don't know what year your 911 is but mine is a 99 that first went into service in May of 1998. I go easy on it until the temp is up and then drive it normal. It's a teenager and I am determined to keep it for 6 more years, it will then be a 20 year old car.
