Thread: Running rough and lacking power

Gary

You can reset the adaptive values by removing both the battery terminals and holding them together for about 30 sec

It looks as if you have fixed it though, great news

Steve

Am not sure there are any adaptive values to reset given that there are no Oxygen sensors to provide feedback to trim the default settings in the engine ECU fuel map.... happy to stand corrected

Hoges you may well be correct !

Like Bluey said, there is no O2 sensors on the 96 model.
I lent my computer the one of our Gosford members that I sold my other Rangie to.
The donor car was running perfect at the time but when I got the computer back the engine now runs rough, rich and at about 3,000RPM to compensate for the extra fuel it is guzzling.
There is a possibility that my friend may have altered the mapping with his new system analyser to make it suit his EMS/ECU and it may need remapping again to suit my system. The damned thing are ultra touchy.
The only other things that can cause problems are the MAF and the Throttle position sensor. Both of these I have changed but the problem still haunts me.
With the BECM, even a dull connection between the ECU and the inputs can cause the fault so please check all of the plugs in the ECU just in case.
After that and if all else fails, the ECU and BECM may require remapping of the fuel mixture settings. It seems like the system is staying in COLD START position.

Good luck Gaz,
Shirley..

1 - P38A 1995
1 - Discovery 2 / 2000
1 - L322 / M62 2003 mod
1 - XJS Jaguar V12 1988 HE.

Gotta love Pommie stresses.......

Maybe I spoke a bit too soon. OK, fuel consumption on a 90k round trip with not too much traffic to contend with, is back around 17l/100k when driving conservatively, which is the really good news . Bad news is that once warmed up the idle is very low at around 550 rpm whilst in Drive and food on brake. In Neutral idle speed increases up to the anticipated ~700 rpm. Acceleration is improved but still feels like it's misfiring up until it gets up around 3000 rpm.

Still no error codes being displayed on the FCR

Gary

Time for new plugs and leads hey ;-) or could be a coil pack on its way out

Originally Posted by Keithy P38

Time for new plugs and leads hey ;-) or could be a coil pack on its way out

Could wel be Keith!plugs were changed last year with the platinum, so theoretically should be ok. Leads, around 3 years...possibly. Coils, a definite possibility.

Gary

Presuming you have re-checked that H/T leads are connected to coils and plugs securely and in correct order...just asking
Platinum plugs should last at least 80 thousand km and three yr old H/T leads if clean, should be OK as well... need to check the coil pack for burning and tracking.

EDIT: another thought occurred to me:

How many km do you have on the current engine? If it is over 200K km in "original" condition, there's a strong possibility that the timing chain has stretched sufficiently to alter the valve timing and cause problems including running rich etc because the EFI pulses are out of proper sequence with valve timing... which may be more significant at low revs... mine was "sloppy as" at 140k km... I am not sure how you could physically test this without removing the front cover... in which case you might as well do the water pump if it hasn't been done already...oh and the oil pump and....