|
|
|
|
| Author |
|
|
Moderator
|
Still dieseling, will it ever stop?
I am lost. I have not had my 85.5 944 for very long and have had idling problems, and dieseling problems. The idle problem was an easy fix, the ICV wasn't working. I replaced that and the car idles perfectly. I also noticed that my spark plug wires were arching across each other and to the motor. Needless to say, I replaced the wires. Well the car still diesels. I have asked friends what would cause this and I have gotten two responses. Coolant is low, or the octane is too low. The coolant is perfect and I have used both 91 and 87 octane gas. Well, it still diesels. The car always runs very cool, even in traffic. The needle is always below the half way mark. I can't think of anything else that could still be causing the car to diesel. Does anyone have any suggestions, I will try anything.
Could the car be running to rich? Or, could it still be getting power to the spark plugs even after I turn the key off?
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
07-12-2006, 10:40 PM
|
|
|
Registered
|
Leaking injector.
__________________
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! |
||
|
07-12-2006, 10:52 PM
|
|
|
Moderator
|
Would that cause it to diesel? Is there a way that I can test the injector to see if they are leaking?
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-12-2006, 10:55 PM
|
|
|
Registered
|
Take the fuel rail off (four bolts) with the injectors attached. Lay it on some rags. Disconnect the black wire at the coil. Crank the engine a bit and check the ends of the injectors.
Be sure to put some light grease on the injector o-rings before you put the rail back into place.
__________________
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! |
||
|
07-12-2006, 11:07 PM
|
|
|
Moderator
|
What should the end of the injectors look like when I do this?
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-12-2006, 11:11 PM
|
|
|
Moderator
|
Am I disconnecting the black wire so the plugs don't get any power?
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-12-2006, 11:12 PM
|
|
|
|
Registered
Join Date: Apr 2005
Location: Ontario, Canada
Posts: 4,554
|
a leaky injector will leak fuel when you do this...
__________________
Kyle 2008 Mini Cooper // '83 Porsche 944 // '01 Mazda Protege [sold] // "Never break more than you fix!" - SoCal Driver |
||
|
07-12-2006, 11:20 PM
|
|
|
Moderator
|
I will go check this right now.
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-12-2006, 11:27 PM
|
|
|
Moderator
|
Ok this is what happened. I removed the fuel rail with injectors and put a paper towel under each injector. I disconnected the center cable to the distributor and disconnected the plug wires at the plugs. Then I cranked the engine over. Each injector squirted gas out over the paper towel. So from what you are saying the paper towel should stay dry. Well I guess that would be my problem then. Is there a way to clean the injector or do I have to buy new ones?
Thanks for the help socal.
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-12-2006, 11:56 PM
|
|
|
Moderator
|
Crap, they are expensive.
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-13-2006, 12:07 AM
|
|
|
Registered
|
I have no idea what new ones cost, but there are always some on ebay.
Try reading this thread first though. how to clean injectors???
__________________
Tom 1990 944S2 Cabriolet 2002 Chevy Silverado 2500HD 2003 Maroon Ford F350 dually |
||
|
07-13-2006, 03:51 AM
|
|
|
Registered
|
You should expect that each injector squirts. What you are looking for is one or more injectors leaking after you crank the engine over. Did any?
Removing the black wire from term #15 cuts the power to the coil keeping it from sparking. Removing the center HV cable doesn't stop the coil from sparking. You could have had an engine compartment fire. You can also disconnect the reference sensor at the back of the engine. Do you know where that is?
__________________
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! Last edited by SoCal Driver; 07-13-2006 at 08:05 AM.. |
||
|
07-13-2006, 08:02 AM
|
|
|
|
Moderator
|
Where is the black wire located? Is that term #15 from the fuse box, I don't understand? I also don't know where the reference sensor is?
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-13-2006, 10:07 AM
|
|
|
Registered
Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
|
There is an updated turn signal relay to stop dieseling. The old one had a voltage feedback which allowed the engine to continue running for a while. Part number is 1HO 953 227
__________________
From November 2012; Precision Porsche Specialist Sussex UK, +44 (0)1825-721-205 2001-2012 Gerber Motorsport Inc. 206-352-6911 07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red 08.16.09 1999 Kawasaki ZRX1100. Green. |
||
|
07-13-2006, 10:13 AM
|
|
|
Registered
Join Date: Apr 2006
Posts: 5,179
|
The black wire is located on the coil which is what the center distributor cable connects to. There in the thich spark plug like wire in the center of the coil, then theres a green ne, anda black one. The black one needs disconneted to stop the coil from sparking.
__________________
M |
||
|
07-13-2006, 01:17 PM
|
|
|
Registered
|
Quote:
__________________
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! |
||
|
07-13-2006, 02:32 PM
|
|
|
Moderator
|
Do you think it could be from the timing? I think the PO might have had the timing adjusted to make the car pass smog. I haven't really looked into it but could that cause the dieseling?
__________________
www.Only944.com Porsche parts, Only better, Only944 87 944 N/A 165,000 miles 84 944 Saved by God, because I could not. |
||
|
07-13-2006, 08:07 PM
|
|
|
Registered
Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
|
Timing is not adjustable. Fuel mixture is. Needs some more diagnostic time to see what is actually happening.
__________________
From November 2012; Precision Porsche Specialist Sussex UK, +44 (0)1825-721-205 2001-2012 Gerber Motorsport Inc. 206-352-6911 07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red 08.16.09 1999 Kawasaki ZRX1100. Green. |
||
|
07-13-2006, 08:55 PM
|
|
1983 Porsche 944 2.5 liter
