Fast Idle On Zx Diesel

[bimmerman]

Hi All,

 

Looks like it's been a bit quiet on here lately. All those ZXs can't have gone to scrapyard heaven yet, can they?

 

Anyway, got an idle problem on a ZX turbo diesel. It's a 97 ZX SX TD, 170K miles. The idle rate has suddenly moved from 950-1000 rpm to 1150ish. The rev range seems spot on at higher revs so looks like the idle setting (or something that can influence the idle rate) has altered. It happened about the same time as I hit a particularly nasty pothole. Fuel consumption may have increased slightly, but can't be sure at the moment. The car feels marginally rougher, but again difficult to tell as it is a subtle change and might be unrelated to the idle problem or engine. I changed the glow plugs earlier this year but these seem secure and appear to be working OK. Anyone got any suggestions as to what to look for. Probably not worth getting it fixed professionally, but would like to keep the car going as it's been very reliable and still has good economy (not much different from the diesel picasso). Thanks for any advice.