help with dieseling problem
Thread Starter
Racer
Joined: Feb 2008
Posts: 290
Likes: 0
From: Sammamish WA
help with dieseling problem
my C5 Z06 2003 with 30k miles started dieseling today.
it isnt a severe dieseling issue. it lasts for about a 0.5-1 sec at most.
i replaced the plugs and wires the weekend before last, with
Iridium tipped plugs (0.04 pre-gapped) part # 12571164
Red wire kit part # 89017270
Gas is (always) 92 octane filled recently.
I have been running fuel injector cleaner for the past 3 tanks but not the current one.
When i had purchased it (as used) a month ago, it had an odd ping (once or twice as opposed to severe detonation) on cold start and in low rpm and low speed situations. So i have been running injector cleaner for a while and i didnt hear any ping.
i did a search and found the following causes:
1. carbon build up (i havent been driving it hard; too much traffic; snow/mild-heavy showers. But i doubt this could be the issue)
2. Hot plug (iridium tips are ok as far as i know. But this set could be defective. Should i have had the plugs replaced with the platinums that the car came with?)
3. faulty/failing injector (
4. timing (unlikely)
i did a search here and it seems that this could be
1. normal issue with these cars (disengage clutch to avoid sputter/dieseling)
2. Throw out bearing
Any clues what could be running hot or what could be causing this?
it isnt a severe dieseling issue. it lasts for about a 0.5-1 sec at most.
i replaced the plugs and wires the weekend before last, with
Iridium tipped plugs (0.04 pre-gapped) part # 12571164
Red wire kit part # 89017270
Gas is (always) 92 octane filled recently.
I have been running fuel injector cleaner for the past 3 tanks but not the current one.
When i had purchased it (as used) a month ago, it had an odd ping (once or twice as opposed to severe detonation) on cold start and in low rpm and low speed situations. So i have been running injector cleaner for a while and i didnt hear any ping.
i did a search and found the following causes:
1. carbon build up (i havent been driving it hard; too much traffic; snow/mild-heavy showers. But i doubt this could be the issue)
2. Hot plug (iridium tips are ok as far as i know. But this set could be defective. Should i have had the plugs replaced with the platinums that the car came with?)
3. faulty/failing injector (
4. timing (unlikely)
i did a search here and it seems that this could be
1. normal issue with these cars (disengage clutch to avoid sputter/dieseling)
2. Throw out bearing
Any clues what could be running hot or what could be causing this?
Last edited by shaggy911; Apr 22, 2008 at 04:01 AM.
Melting Slicks
Joined: Oct 2006
Posts: 3,447
Likes: 6
From: Los Angeles
Question: Does this occur when you turn off the car when the car is in neutral and the clutch is out? Does the dieseling condition you describe still occur if you shut off the car with the clutch in and while in gear?
If the sound does not occur while turning off the car with the clutch in... it is not dieseling. It would be the infamous "death rattle". Which is also 100% normal.
Try this first and see if the condition is still occuring.
If the sound does not occur while turning off the car with the clutch in... it is not dieseling. It would be the infamous "death rattle". Which is also 100% normal.
Try this first and see if the condition is still occuring.
Melting Slicks
Joined: Feb 2006
Posts: 2,172
Likes: 104
From: Des Moines Iowa
Can't diesel for very long..........once you turn the ignition key off, the fuel injectors quit working.........can't diesel without a fuel source. Usually dieseling is result of a hot engine, fast idel, and continuous source of fuel, as in old engines with carburator, and mechanical fuel pump. How is your idel speed and engine temp?
Tech Contributor
Joined: Jan 2007
Posts: 19,354
Likes: 1,126
From: Dyer, IN
Can't diesel for very long..........once you turn the ignition key off, the fuel injectors quit working.........can't diesel without a fuel source. Usually dieseling is result of a hot engine, fast idel, and continuous source of fuel, as in old engines with carburator, and mechanical fuel pump. How is your idel speed and engine temp?
