Hi All,
Just got back from my mechanics shop. He said that he did a thorough vacuum check and all ok. New MAF and both O2 sensors. He said it was reading +25% but needed to be between +10 & -10%. He said he tried do a Fuel Adaptive Relearn but his SnapOn machine wasn’t set up for it. The nearest Land Rover repair facility is
150 miles away. Anyone know what kind of machine is needed to reset the fuel trims? Thanks in advance.

 

Nanocom will do it, you can rent it from my website but very rare that procedure is required. Not unheard of but rare. Have you tried disconnecting the battery and grounding the positive battery cable?

 

No Sir but you can bet I’ll try it Sunday. Thanks 👍

 

Good new is that Fuel Trims will adjust automatically as you keep driving, so long as the underlying problem has been corrected. Should only take a few drive cycles (cold to hot engine coolant temp).

 

What is your website? Or do you have to PM me with it? Don’t want to violate any rules.

 

www.extinctmotorsports.com

 

Positive grounding didn’t help. I also tried a hard reset on the ECU which didn’t help either. I’m going to check the fuel pressure with another gauge this weekend. As I recall it should be about 35 PSI. Anyone, correct me if I’m wrong. Thanks

 

IMHO the fuel trims are that positive because you either have a vacuum leak or a plugged injector (very rare). You can test for the plugged injector by swapping the injectors left to right and see if it follows the swap. BTW, the injector o-rings are a common source of vacuum leaks. Something else to try, you can do the shop vac test on the intake too. Connect a shop vac to the intake hose after removing the maf and airbox lid with the hose set so it blows in to the engine. Have someone hold the throttle open while you spray the engine down with windex - look for bubbles.