Thread: Fuel pump question for dual fuel 96 auto disco

I don't know how critical it is, Mark, but if you have it out, it would pay to tweak it to the correct distance & then you'll know it's right.

Obviously, shorter is better than too long & I wouldn't think 4mm is going to make a lot of difference as it adjusts in pulses, but if it was me I would set it correctly.

Sounds good to me; I'll attack it tomorrow!

Ta

Let us know how you get on, please.

Ok, my stepper is now spotless and the pintle length is 27 mm.

After digging around for something I came across a while ago (searched for 'MAF resistance'), I checked my outside terminals and measured 8.8 ohms . Rotated the pot until I had 173.5; what have I just changed?

Also, the MAF interior looked brand-new shiny but I couldn't see any wires. Should they be easy to spot?

I'll report back on any changes when I've done a few kms.

Ta!

Mass Air Flow Sensor Contamination:

Contamination of hot-wire type sensors does occur. Usual suspects include substances like silicone potting compound, dirt, oil and spider webs.

Potting compound, used in the manufacture of the sensors to environmentally seal them can migrate onto the wire.

Oil most often enters a MAF in the form of vapor via an engine’s PCV system. In an effort to lower emissions, positive crankcase ventilation systems use a PCV valve to draw fuel and oil vapors from the crankcase, this can allow blow-by gases to make it past the piston rings, and reintroduces them into the intake system upstream of air flow metering devices. When a throttle body or airflow meter needs cleaning, the oily film that is removed is largely a product of this system.

Copyright © 2006 K&N Engineering, Inc. All Rights Reserved.

The "Hot Wire" is in a small bypass channel & can't be seen from outside but you can see the holes for it. You need a torx #??? to remove the MAF end carefully & inspect the wires. Mine appeared clean, but I blew some metho over them just in case. I don't know whether it made a difference or not.

Eventually, I replaced the 'Coolant Temperature Sensor' after advice from on here, & it seems to have been ok since then.

I don't know what that Pot. does & I don't go there. Turn it back to where it was. You did count the turns didn't you?