Originally Posted by XH_99_JP
I have a 99' XH 4.0L I6, for a while now the thing has been running like crap... Im told the timing is ok...? which i can't be sure as i have a timimng light but the mark on the pulley doen't really line up with the mark on the block, to me it looks retarded about 25mm? i also noticed looking yesterday that there is a miss and the plugs and leads are quite new...
The problem im having is that my ute is just running sluggish... It seems to have lost the pickup it used to have eg: used to be able to spin thru first and ssecond if i was to take off quick, now when i hit second it bogs down and is sluggish up through to about 4grand... Could it be maybe something to do with the coil or dizzy??? or even timing?
Maybe and oxygen sensor or something could be causing the miss???
Any suggestions as to what i can test would be awesome...
If the basics are OK (fuel/air filters, plugs and leads) I would next check the coil. These coils use to crack and leak through the block, it's a very common problem. Don't just check for spark because it'll probably seem ok, instead, remove the coil from the engine and take the brackets off the coil, then look for cracks where the brackets were fitted.
If this is all good go for the fuel pump next. Let me know if you have any dramas, cheers