Engine rough at Red light, also hesitates from dead stop
#2
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Pure guess......................possible motor mounts?
Would need to know alot more, including service history.
Might want to start by reading these!
https://www.rx8club.com/new-member-forum-197/new-potential-owners-start-here-202454/
https://www.rx8club.com/new-member-forum-197/congratulations-you-got-8-a-202548/
https://www.rx8club.com/new-member-forum-197/rx-8-faq-please-read-before-posting-959/
https://www.rx8club.com/showthread.p...&highlight=FAQ
Would need to know alot more, including service history.
Might want to start by reading these!
https://www.rx8club.com/new-member-forum-197/new-potential-owners-start-here-202454/
https://www.rx8club.com/new-member-forum-197/congratulations-you-got-8-a-202548/
https://www.rx8club.com/new-member-forum-197/rx-8-faq-please-read-before-posting-959/
https://www.rx8club.com/showthread.p...&highlight=FAQ
#3
Surf Hard, Drive Hard
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That's a decent list. Be careful with the MAF.
How long since plugs have been changed? Coils?
Not saying it needs those at, all just thinking ahead if it continues or gets worse.
How long since plugs have been changed? Coils?
Not saying it needs those at, all just thinking ahead if it continues or gets worse.
#11
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No change if I turn on or off fan or A/C. I did put some STP Fule injector cleaner in and it may have less lag when starting from a dead stop but will monitor for a day. So for clarification besides the lag discussion, the rough idle only occurs when in D or R, runs smoother in P or N.
#15
I am totally confused, I am having the same problem with my 8, rough idle and stalling at a red light. I'm able to restart after a little cranking. the funny thing is it idles fine when its cool temps outside, I've noticed when it gets hot out like 90-100 deg is when the trouble starts. It will start fine cold but after the engine gets hot, the troub starts, have had no problems in the winter mos, just the summer,I have an 06 auto with the bhr coils, 75k miles I've just changed the plugs and the MAF... runs a little better but I really haven't put it thru its paces yet. any sugg. would be welcome....but I am dying to know how a motor mount affects idle!! other than allowing the motor to move around a bit more but dont u have to have the rough idle first? I"m 54 yrs old and I have done competitive auto and motorcycle racing and wrenching, so I at least know which end of the plug goes into the motor....but I am stumped by this motor mount thing.
#16
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I am totally confused, I am having the same problem with my 8, rough idle and stalling at a red light. I'm able to restart after a little cranking. the funny thing is it idles fine when its cool temps outside, I've noticed when it gets hot out like 90-100 deg is when the trouble starts. It will start fine cold but after the engine gets hot, the troub starts, have had no problems in the winter mos, just the summer,I have an 06 auto with the bhr coils, 75k miles I've just changed the plugs and the MAF... runs a little better but I really haven't put it thru its paces yet. any sugg. would be welcome....but I am dying to know how a motor mount affects idle!! other than allowing the motor to move around a bit more but dont u have to have the rough idle first? I"m 54 yrs old and I have done competitive auto and motorcycle racing and wrenching, so I at least know which end of the plug goes into the motor....but I am stumped by this motor mount thing.
Hot starting / running problems can be a classic symptom of low compression.
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