So the timing belt tensioner just went out on my car. I don't think the valves were damaged becuase the belt never came off. I just had the tensioner replaced and the engine timing done. However now I have a very rough idle, that sort that mustangs that have a stage 2 or 3 cam have. In the past I adjusted the exhaust and intake cams to -/+ 4 degrees respectively(can't remeber which was which but I did it to IPD's recommendations for turbo engines). I was going to undo this as advised by a volvospeed member but then the timing belt tensioner went. So my question is could this timing on the exhaust and intake cans be causing my very rough idle? Or is it more likely plugs, coil, etc? Also is this bad for the engine? I don't want to run the engine if it could dammage it long term.
Extra note, it backfires a ton when I step on the go pedal when at speed.
Thanks
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2 replies to this topic
#1
sdancer
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Posted 24 December 2011 - 02:21 AM
98 S70 glt. ARD Green tune 17psi, 15g swap, OBX exhaust straight piped, IPD HD TCV, silicone lines, KONI FSDs, IPD Sport Springs, slotted rotors IPD, IPD strut bar
#2
boxpin
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Posted 24 December 2011 - 05:45 AM
It does not say in your thread that you double checked the timing marks...have you?
Edited by boxpin, 24 December 2011 - 05:46 AM.
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1995 855M - Quaife, 18T, ARD Blue, Meth, 3" catless, FMIC, N/A(cams & TB), Scone, H&R, Bilstein
#3
fischmama
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Posted 24 December 2011 - 03:58 PM
sdancer, on 24 December 2011 - 02:21 AM, said:
So the timing belt tensioner just went out on my car. I don't think the valves were damaged becuase the belt never came off. I just had the tensioner replaced and the engine timing done. However now I have a very rough idle, that sort that mustangs that have a stage 2 or 3 cam have. In the past I adjusted the exhaust and intake cams to -/+ 4 degrees respectively(can't remeber which was which but I did it to IPD's recommendations for turbo engines). I was going to undo this as advised by a volvospeed member but then the timing belt tensioner went. So my question is could this timing on the exhaust and intake cans be causing my very rough idle? Or is it more likely plugs, coil, etc? Also is this bad for the engine? I don't want to run the engine if it could dammage it long term.
Extra note, it backfires a ton when I step on the go pedal when at speed.
Thanks
Extra note, it backfires a ton when I step on the go pedal when at speed.
Thanks
The belt could have still skipped a tooth (or more) when the tensioner failed. If you didn't check if the timing was still good with the original set up, I would say that you do have valve damage. Granted that you checked timing is correct now.
1998 Volvo S70 T5M - 04 R Motor - T3 60Trim @ 19PSI - 3" Custom Exhaust - TT/MegaSquirt 3X - FMIC w/ 3" piping - TA Coilovers w/ Custom Rears
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