02-19-2007, 05:31 AM
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#1
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Registered User
Join Date: Feb 2007
Location: malta
Posts: 210
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low rev misfires
hi, can anyone help me? ive got a porsche boxster 986, and lately i started having misfires in the engine only in idle. when accelarater is pressed slightly, the misfires disappear, but on idle the engine will sometimes also die. i have the engine check bulb on and sometimes it blinks. ive been to a porsche garage and they are finding it hard locating the problem. they changed the lambda sensors, checked ignition coils, but to no avail. the problem is that the engine is only operating on 3 cylinders in idle position, but when in motion all 6 will fire up. the annoying thing is engine dying in traffic!! any suggestions?
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02-19-2007, 06:40 AM
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#2
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Registered User
Join Date: Jan 2007
Location: Texas
Posts: 1,311
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Quote:
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Originally Posted by boxster
hi, can anyone help me? ive got a porsche boxster 986, and lately i started having misfires in the engine only in idle. when accelarater is pressed slightly, the misfires disappear, but on idle the engine will sometimes also die. i have the engine check bulb on and sometimes it blinks. ive been to a porsche garage and they are finding it hard locating the problem. they changed the lambda sensors, checked ignition coils, but to no avail. the problem is that the engine is only operating on 3 cylinders in idle position, but when in motion all 6 will fire up. the annoying thing is engine dying in traffic!! any suggestions?
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What year is your boxster and how much mileage is on it? Have you had your spark plugs changed yet?
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02-19-2007, 07:06 AM
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#3
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Guest
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If you can, adjust your throttle cable where it meets the throttle body so it has a "stronger" idle. That way it would be like holding your foot on the gas a little when at a stand still. And maybe keep your car from dieing.
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02-19-2007, 08:13 AM
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#4
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Registered User
Join Date: Oct 2006
Location: smyrna ga
Posts: 210
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Over the weekend i was at my mechanics shop and he had a 99 996 in that wasn't running correctly under load.
After hooking up the obd scanner to it he found out that the engine was misfiring on 2 cylinders. His diagnosis is that a cam adjuster was bad so the engine was severely out of tune which was causing the misfires.
Whether or not this applies to your situation or a boxster for that matter, a misfiring cylinder is a severe issue and i hope you are not driving the car anymore until it's fixed.
__________________
- ian
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02-19-2007, 12:57 PM
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#5
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Registered User
Join Date: Feb 2007
Location: malta
Posts: 210
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Quote:
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Originally Posted by idheaton
Over the weekend i was at my mechanics shop and he had a 99 996 in that wasn't running correctly under load.
After hooking up the obd scanner to it he found out that the engine was misfiring on 2 cylinders. His diagnosis is that a cam adjuster was bad so the engine was severely out of tune which was causing the misfires.
Whether or not this applies to your situation or a boxster for that matter, a misfiring cylinder is a severe issue and i hope you are not driving the car anymore until it's fixed.
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the obd is just saying that its misfiring on 3 cylinders when idle, its not giving any diagnosis. now theyre gonna check the catalytic converters.
at the moment im still using it yes, you think i shouldnt?
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02-19-2007, 12:59 PM
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#6
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Registered User
Join Date: Feb 2007
Location: malta
Posts: 210
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Quote:
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Originally Posted by boggtown
If you can, adjust your throttle cable where it meets the throttle body so it has a "stronger" idle. That way it would be like holding your foot on the gas a little when at a stand still. And maybe keep your car from dieing.
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good idea, at least i can do that until the problem is fixed!
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02-19-2007, 02:04 PM
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#7
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Registered User
Join Date: Jul 2005
Location: Denver
Posts: 740
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Have they checked the MAF?
__________________
'06 Cayenne Turbo S, Beige Metallic/Tan
Ex - '99 Arctic Silver, Red Interior, Silver Top
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02-19-2007, 05:08 PM
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#8
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Hi,
Could be MAF, Fuel Filter, or any number of other things including a mechanical timing issue. I would not risk driving the car until it is sorted, you could cause major damage in some instances...
Happy Motoring!... Jim'99
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02-20-2007, 03:10 AM
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#9
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Registered User
Join Date: Feb 2007
Location: malta
Posts: 210
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Quote:
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Originally Posted by denverpete
Have they checked the MAF?
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no i dont beleive they did. could it be that it needs replacing?
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02-19-2007, 12:50 PM
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#10
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Registered User
Join Date: Feb 2007
Location: malta
Posts: 210
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Quote:
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Originally Posted by porsche986spyder
What year is your boxster and how much mileage is on it? Have you had your spark plugs changed yet?
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yes ive had them changed. its a 1999 model with 69,000 miles on it
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03-03-2007, 02:23 AM
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#11
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Registered User
Join Date: Dec 2006
Location: California
Posts: 17
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hmmm
its a MAF problem for sure.
The problem you mentioned, is exactly what i had. I tried to diagnoses it with vacuum leak test, i even took it further to test the Air/fuel ratio, smog check etc. to test the stalling, I tested the Fuel pressure to see if fuel filter is bad or pump is bad, i even had the Coil over plug checked, spark plugs. I cleaned the idler controller, i cleaned the throttle body, tested the ignition module etc. etc.
don't waste your time its MAF, if it isn't then move to the idler contoller to see if its working properly
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