Help! Car missing - Need New Exhuast Valve (Have Questions - labor prices/required)

[bryanlee38]

Recently got my stock standard r33 from the compliancing workshop. Went in fine and came out missing pretty bad - car was missing @ stand still position at low revs, also stuggles to accelerate. Was told my mechanic that i'm goin to need new exhuast valves.

Compression test showed one cylinder was @ 115 and the other 5 were @ 170

Have put new sparkplugs, old ones looked fine when taken out.

Coil packs are working fine.

AFM is working fine.

The mechanic has pinned point that i require new exhuast valves. I only have very very basic mechanical knowledge, what is required to change the exhuast valves ... i was quoted $1500 for the whole job. What is involved ... and does the price sound right to get it the job done? Is this pretty tricky or through the right guidance a possible home job?

regards

bryanlee

[SteveL]

Recently got my stock standard r33 from the compliancing workshop. Went in fine and came out missing pretty bad - car was missing @ stand still position at low revs, also stuggles to accelerate. Was told my mechanic that i'm goin to need new exhuast valves.  

Compression test showed one cylinder was @ 115 and the other 5 were @ 170

Get a second opinion. Based on your compression readings you have 5 good cylinders and one bad. You certainly shouldn't need to replace ALL the exhaust valves. Your mechanic should be able to identify the problem with the bad cylinder - the best way is a leakdown test.

If you have limited mechanical knowledge, best let someone do it for you.

Also I'd be asking some q's about why the car went into the shop running fine but came out running crap....usually doesn't 'just happen' like that....

[bryanlee38]

yeah the workshop doesnt know either ... they r a decent bunch of blokes there. Nothing sus on the workshop. More on the vehicle. Mechanic of the workshop reckon its an electrical fault. But besides the coils, plugs, leads, afm or the ecu ... i cant see what the issue could be. Does $1500 sound right to get the exhuast valves changed? Its a fairly big job from what i heard ... understand the problem just occured overnight. Not through a span of time. What other problems could it be?