Fuel Issue

CMF_Affroken

» CMF Member
Member since:
Posts:
Hey,

I've posted lots of questions recently, so thanks everyone for the help!

I have one final question...

I've got a 998cc early 2000 Nissan March Auto (Japanese Import).

It actually runs pretty good apart from two annoying points:

1. It's only getting about 23mpg even when cruising. I know it's an auto, but shouldn't it be a bit better than that?

2. It's got a shudder when idling in drive and reverse (especially in reverse), but not in neutral or park.

I've checked the o2 sensor - it seems to be working.
I've checked the tps - it has the right resistance.
I've checked it in the diagnostic mode - no fault codes, exhaust test come back good (light flashed about 20-25 times in 10 seconds during test).
I've tried re-soldering the maf - no difference.
The car has been serviced and had all spark plugs, distributor, oil, brakes, air filter, fuel filter etc changed.
I've checked the vacuum hoses as far as I can see all are fine.
The engine mounts are in good condition.

I'm out of ideas. I could clean out injectors or change throttle body - but these are either expensive or tricky options and not even sure they'd make any difference.

None of the problems it has are fatal, but they're driving me mental...

Can anyone think of something I've missed?

Appreciate your help.
 
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