Outer Limits 4x4 Board

Hey guys can any of you mechanic gurus help me out we have a nissan 4.5 petrol 99 model in here we just fitted a buedesert 2 3/4 exhaust to. and the owner took it and it developed a miss a couple of days later a realy bad miss almost like its not firing on one cylinder at all we have done a few checks on it and found nothing I dont think it has anything to do with the us fitting an exhaust to it but I may be wrong has anyone had any experience with these it has over 200,000 thousand on it and the lifters are fairly noisy So I'm thinking dropped vavle?

It may not be of much help but I have heard the computers in the 4.5 take a lot of time to "adapt" to things, like Hi-clones etc. But this is not first hand knowledge so it may be of no use to you!

I'm no mechanic either, but I have a 99 model GU 4.5 petrol and it was fitted with extractors and 2.5 inch exhaust. I didn't have any problems from fitment of a bigger exhaust system.

There must be something else wrong with it. Maybe the dizzy. Good luck with it. Overall the 4.5 is a strong engine and the dizzy is the only part of the engine that ever let me down. By the way, the dizzy is made by Mitsubishi.

Is it blowing any smoke. If it has drop a valve it will be very noisy. Im guessing you checked spark and thing like that. Check compression, that will pick a droped vavle straight away I very much dout its your fault.

OnPatrol wrote:I'm no mechanic either, but I have a 99 model GU 4.5 petrol and it was fitted with extractors and 2.5 inch exhaust. I didn't have any problems from fitment of a bigger exhaust system.

There must be something else wrong with it. Maybe the dizzy. Good luck with it. Overall the 4.5 is a strong engine and the dizzy is the only part of the engine that ever let me down. By the way, the dizzy is made by Mitsubishi.

Sorry for offtopic, Anymore info on your dizzy? What happened? How many kms etc? What did have to do to fix it etc?

Just a concerned 4.5 Owner! I recently got back from a rather remote trip, had something have gone wrong out there we would have really been in the shiat! Thanks Dan

The 4.5 have a very similar distrubutar to the nissan vl motor I'm pretty sure
and they were forever packing it in.