i know ive asked before but i have had no joy fixing the problems and i think ive explored almost every avenue now

 

my car has a vibration at idle through the body of the car. the engine is very smooth now after sorting so may little issues but i dont think i should be aable to feel vibrations through the steering wheel or body.

 

could this be my gearbox mount causing the problem?

 

i am still to replace the spark plugs aswell but they looked fine when i checked them.

 

also sometimes the car starts as soon as i turn the key, other times it takes a few seconds.

it is not misfiring but there is a rythmical putting with the exhaust note ( perhapse 7 times per second) that i think may be intime with the vibration.

 

i would consider myself an experienced mechankc but this has me frustrated:headvswal

 

please help

I consider my car to be in great running condition, but I have this very slight vibration at idle as well and my gearbox mount is new.

Since I've had the manual conversion done and the neutral switch as not been utilised, the car ticks over at ~850ish (ecu timing at 25). It idles much smoother now.

Regarding your starting - it could be the warnings of a failing PTU. Mine just packed up 2 weeks ago & I have replaced it with a revised gen2 PTU.

I am not aware of any vacuum leaks, but perhaps a very small one might cause little vibrations.

Also check your brake booster, sounds odd I know, but I had been living with a failing unit for 2 years and it had a little leak. Now under boost it didn't make any difference as there is a 1 way valve between booster and balance bar, but at idle a leaking booster is a vacuum leak.

Improved my brakes a great deal as well!

i applied presure to the booster and it held fine:mad:

any more thoughts

I know this may sound odd, but i had vibrations when idle and driving when cold, That was the prop bearing but odly now it dosent vibrate when idle ither?? thought it would of only cured the driving vibration?

get it on a conzult chap, do a cylinder drop test and also try a known good ptu

im thinking that is the way forward. i have a week off in a few weeks so i might try and get over to jeff