Issue with accelerating and decelerating

[pomfritz]

So I’ve noticed a change to how the van is driving lately. It happened after swapping out the Throttle Body with a rebuilt unit. The idle seems fine at around 800-850. It seems to run fine but here is what I’ve noticed in the few weeks since the repair

The van has stalled three times while the engine was still just warming up and I was just starting to drive it. Going about 10 mph and just dies
Starts right up and then no issues.

It bucks more easily than before the repair. Meaning if I don’t give it enough gas the van sounds like it’s stalling out. I know it will do this but it is much more sensitive and does much more readily than before.

The acceleration seems more sensitive, like it needs more gas to get going but too much causes it to buck

I suppose this sounds like i don’t know how to drive, but I didn’t have any issues like this before and it seems like some adjustment is needed but don’t know what to do.
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83.5 233K. GW 2.3, SS exhaust, My German Frau named her Stefi

[0to60in6min]

hmmmm... my first though is the FPR, fuel pressure regulator - how old is it? is the vac. hose on it is OK?

[Igeo]

As you manually open the throttle (engine off) you should hear a little click just as as it opens then it should click again just before full throttle. That's your throttle position switch. Then as you close the throttle, you should hear the clicks of the switch again coming off full throttle and then again just before closed throttle. There is a procedure you can search for a precise adjustment, but doing the above will tell you if it's close. Did the rebuilt TB come with a new switch?
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1987 Westfalia 2.1 WBX Manual

[pomfritz]

FPR is fairly new, about three years old. will check hose but I may have replaced it too at the same time as I did the fuel lines around then too.

The TB was rebuilt by Frank Condelli, the swtiches are not new but he says he tests them and that the only adjsutment I needed to make was to the idle screw.

BTW this is the TB with the two switches.
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83.5 233K. GW 2.3, SS exhaust, My German Frau named her Stefi

[crazyvwvanman]

It could be that the idle switch is sometimes sticking in the idle mode.
Try unplugging one of the wires to the idle switch and driving it that way to see if it changes the symptom much.

Mark

[Nitramrebrab72]

Idle seems a bit low as well

[Igeo]

You say "switches". Is your 2.3 using a TB with 2 switches? Wasn't that iteration for the 1.9?
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1987 Westfalia 2.1 WBX Manual

[pomfritz]

It’s a 2.3 from GW. It uses the 1.9 components.

That idle switch looks like good lead.
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83.5 233K. GW 2.3, SS exhaust, My German Frau named her Stefi

[Igeo]

OK. I guess your year is wired for 1.9.
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1987 Westfalia 2.1 WBX Manual

[pomfritz]

Have a few questions on how to do this adjustment.

Note. 1.9 digijet. 2 switches,

Here’s the Bentley page I am working on:

I see the screw. (2) to adjust, but what is meant by closes?

Here is what my switch looks like closed:

Here I am opening the throttle and this is where I hear a click

FWIW, There’s threads to turn the screw in but not many to turn it out.

I’m not sure if I turn the screw in, then how much do I turn it? It’s seem like I will open the throttle some while in its closed position but nothing will change in the switch, as the copper looking bar is already pushing against the switch all the way. Make sense?

I’d like to see if I can figure this out on my own, with some help from the samba

Thanks.
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83.5 233K. GW 2.3, SS exhaust, My German Frau named her Stefi

[dabaron]

with the throttle in the "i'm not touching the pedal" position, turn the screw so the switch contact is depressed and you hear the click then turn it a full turn more. this ensures that the contact is firmly closed (making electrical contact)
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1991 Vanagon GL Camper
i had no idea i wanted to be a mechanic
"burnin oil and cookin coils" -- Destructo

BiWerks Design, LLC

[plummerdesign]

This is an older thread BUT I wondered if it brought the desired fix?
The OEM throttle body with the 3 switches is tough to adjust without proper diagnostic equipment. I've had TB rebuilds and suffered the same challenge!
.
It is worth mentioning that changing over to the GW throttle body system is a fine solution (keep the old unit just in case something goes wonky).
.
Jeffery : )
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It is old and green and it makes me grin.
1984 Westfalia 1.9