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NEED HELP! Rough IDLe, Long cranks, Backfiring!

Old 07-28-2007, 11:11 AM
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NEED HELP! Rough IDLe, Long cranks, Backfiring!

I need help, i'm new to the forum. I have a 04 GT rx8 6spd manual; its got 56k miles, and recently its been idling rough at stops, taking a bit longer to crank (sounds different too), feels like it's losing power through the 1st 3 gears (feels bogged down) and when i redlined it the other day while sitting idle it was backfiring after the 9k rev.... any ideas on what it could be?? Sorry if this was already posted and asked, i couldnt find one with all the problems that i've had. Thanks for your help.
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Old 07-29-2007, 06:11 PM
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Sounds like it could be lost compression... Which is NOT a good thing. Take it to the dealership, you should still be under warranty right (till 60K?)
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Old 07-29-2007, 06:13 PM
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backfires are normal, rough idling is normal the lost power isnt get it checked out and have a compression test run on it. the cranking might be because u have the old battery they have a new better battery that should fix it
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Old 07-29-2007, 07:34 PM
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Mine backfires off a high rev.
Power lose,,,,, visit a dealer.
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Old 07-29-2007, 07:37 PM
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Try running some fuel injector cleaner through, they may be clogged up, thus causing the loss of power. I had every one of your symptoms.
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Old 07-29-2007, 08:36 PM
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^^^^ agreed, that helped when mine was running sluggish, as for the rough idol, its prob your a/c making it idol rough, and mine always backfires. Mine also idols rough when warmed up and hella rough with my ac on recirc. But its not sluggish
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Old 07-29-2007, 09:14 PM
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Rotary's that have back firing problems usually are a result of fouled plugs. Weak compression doesn't mean that a rebuild is necessary. Any low mileage rotary with weak compression is only weak cause of excessive carbon build-up. Some time this week I'm going to be posting a thread on doing a proper BG carbon cleaning of the engine. I can almost guarantee it will fix a very large percentage of these typical Rx8 issues and void a possible future engine replacement.
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Old 07-30-2007, 03:18 AM
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Originally Posted by T-von View Post
Rotary's that have back firing problems usually are a result of fouled plugs. Weak compression doesn't mean that a rebuild is necessary. Any low mileage rotary with weak compression is only weak cause of excessive carbon build-up. Some time this week I'm going to be posting a thread on doing a proper BG carbon cleaning of the engine. I can almost guarantee it will fix a very large percentage of these typical Rx8 issues and void a possible future engine replacement.
cant wait.

beers
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Old 07-30-2007, 03:59 AM
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my car was idling rough and cranking too long, turned out i needed new coils
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Old 07-30-2007, 04:10 AM
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I had the same issue except for the after burn. It was a bad coil that wasn't bad enough to throw a CEL. It should be under the emissions warranty.

John
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