Mk3 judders when accellerating, stalls with MAF unplugged. Sensor wires clean.

[Mr.Tom]

I know there are a few threads with similar problems, but I tried what they said, and am still having troubles. Excuse my non-technical terms. I kind of know what things do, but don't know the names of them all yet

As the titles says, when I change gear, I get 1 or 2 small jolts or judders, then speed up fine.
I unplugged the MAF, and didn't get the problem, but it did stall when the revs dropped (3 times while I was turning in an estate, had to jump out and plug it back in to get going, embarrasing times :s )

Idle is a little lumpy too.

I took the MAF sensor block off and had a look at the wires and channel which are perfectly clean, so can see that is not the problem.

Recently also changed:
Brake servo assist hose.
Small rubber hose that looks to go from intake to injector rail? (about 6 inches of cotton braded rubber hose on right of intake)
New spark plugs (not changed the leads yet tho)

Cleaned out the black rubber pipe that goes from the top of the engine to the tube from MAF to TB, and down to the front of the engine. That was pretty gunked up.

So, could it be a faulty MAF? It's a Hitachi, but not seen many around. Looks like it fixes to the filter box differently, but if I swapped out for a Boch (which seem more readily available), would it work (with adaption to filter)?

Many thanks.

[Nellie]

Hey,

Just a question cause I am not to clued up on all the jargon LOL!!! Whats "MAF" ?

[Mr.Tom]

From Wikipedia: A mass air flow sensor is used to find out the mass of air entering a fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor.

Mine is sorted now, there was a patch of crap on it I missed

[robz]

glad ya sorted it m8, sorry didnt see this thread till now

[Mr.Tom]

Still idling rough. Running low on ideas now :/

[Matty-MK3]

Cleaned the TB?

[Mr.Tom]

Yeah. Not a spot of dirt anywhere on the tb now.
Relay 30 is warm after use (was suggested before), so not faulty there.

If I put my foot down, it will accerate fine, when I lift my foot, I get a small surge of power.
Got a cheap s/h MAF that whould be here in next couple of days, so will try that too.

Only other thing I can think of at the minute is an oil change. It looks like it could do with changing anyway, so willing to give that a shot soon.

[robz]

if i were you i think i would do all the vac pipes again, im the same position and im certain its them pal!!
may just be a small leak somewhere!!
doesnt take much!

[Len]

Checked relays?

[robz]

hes already done that len, lol