Outer Limits 4x4 Board

G'day, in a couple of weeks, my family and I will be going on an 8000km drive to WA and back. I want my old turbo diesel Pajero to be just right. I will be getting a full service as well as pre trip inspection, and then getting my Paj dyno tuned and possibly have some new injectors fitted. I am undecided about the fuel injectors though, and would like some feedback to see what others may do in my situation.

My car has an upgraded fuel pump, runs about 14psi boost, and has a 2.5" exhaust. This was all set up in 2007 and hasn't been tuned since then. My fuel injectors haven't been touched since 2006, and have probably done 200,000km give or take. My car still runs well and has reasonable fuel economy, but it has declined a bit lately (I get somewhere around 10.5 L/100km on the highway, when in the past I have got 8.5 at it's best), but I think that this may have more to do with changing tyres from 31" Yokohama Geolander AT-S to 31" Maxxis Bighorn. If I go ahead and get my injectors rebuilt, will I see instand results and benefits from the new injectors or will it take time for these injectors to 'settle in' ? Should I be dyno-tuning the car and not worrying about the injectors on this occasion? What I am after on this drive is torque and fuel economy, not power or anything else... My budget is around $900 for both the tune and replacing my injectors... If people could give me their thoughts on this info that would be great, as I am unsure at the moment. There is good and bad, whichever way I decide to go...

Thanks, Sam

I would just use an injector cleaner, give it a run and then get it tuned (fuel %)

Bazzle

When your getting your tuneup ask the mechanic to test them
heres a few tips from ehow


•1
Test the opening pressure of the fuel injectors. It should fall to 300 psi or less. Anything over this level indicates you should replace the injectors or have them reset to original standards.

•2
Assess the nozzle tips on your injectors and see if they need replacing. It's best to spend the extra money and use new nozzle tips as opposed to reconditioned ones since they're not always up to par standards.

•3
Watch for black smoke coming from your exhaust. This can be a sign of injectors that are leaking.

•4
Check for blue smoke coming from the exhaust as this is a sign of trouble such as low engine compression, scored cylinder walls, worn piston rings or leaking valve stem seals.

•5
Take notice of a decrease in power combined with an engine that idols roughly. You may also see white smoke coming out of the exhaust even after the engine has run for awhile and had time to warm up. Dirty injectors can cause these symptoms.



Read more: How to Troubleshoot Diesel Fuel Injectors | eHow.com http://www.ehow.com/how_4453141_trouble ... z0wwawtBhk" onclick="window.open(this.href);return false;

Thanks for the info. I did speak to the person tuning my car today and questioned whether or not we should do my injectors (my budget is strictly $900 for tune + injectors, but the less it costs the better), and I was told that the injectors would be checked on the day (once hooked up to dyno) and that they would make a decision then. I explained that any money saved would be going straight to my WA trip, and they agreed with me so I guess i'll just wait until Monday 30/8 and see what happens then.

service on injectors including new nozzles roughly $450
then spend the other half on a going over on the car