Hesitation & stalling when hot (was: camping...)

[PEI Jonny]

Hi folks, I figured I'd post here rather than start a new thread. I'm having the same issues once engine is warmed up I can hardly get out of first gear from the hesitation, bucking and stalling, luckily I live downhill so I can coast home!
Driving a 78 westy, fuel injected, GE engine, my distributor doesn't have the vacume advance, thinking it's a 009
So far I've checked and replaced the fuel filter , cut that open and had nothing in it, was rather clean actually.
Then I checked for vacume leaks, found a few, fixed those and tried driving again, still the same hesitation/bucking, to the point that the bus stalls.
Tonight I replaced the plugs, which were fouled black badly. So then I thought I had fixed the problem. But to no avail. Let the bus warm up in the driveway, took it for a spin around the block, once getting about .5 mile away from home, same thing started happening. I notice this time that it took longer for this to happen so I'm sure replacing the plugs helped a little, but still bucking, stalling, to the point where I barely made it home and couldn't get out of first gear
It seems to me that I'm not getting fuel? Maybe dirty injectors? Bad fuel pump? I plan to order a new pump just in case. Checked the plug wires and rotor, points, all seem fine, but will look closer at that as well. bought this bus last October, drove it for a few weeks then stored it. It ran fine before parking in the heated garage for the winter. Any info would help! I'm new to this FI stuff so I'm slowly learning as I go!
Thanks in advance!!
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'70 vert
'72 super
'73 std beetle( not running)
74 std beetle ( not running)

[airschooled]

Hi there,

Do you own, and know how to use, a multi-meter? If so, I would recommend using the component checking chart on p. 40 of the fuel injection training and troubleshooting manual.

https://www.thesamba.com/vw/archives/manuals/afc_f...Manual.pdf

Pay special attention to "pins 13 and ground" as this is your head temp sensor, or warm up sensor. It is called TS2 by most people.

(The last four tests on the page are useless in your case; ignore them. You may not have "3 and 18" function either, no problem here.)

If you don't have a multi-meter, I recommend this one, as it does everything you need and nothing more.

https://www.amazon.com/gp/product/B000R8NL8I/ref=a...d7e9fbda83

Familiarize yourself with where the TS2 is located, because my crystal ball tells me you'll be looking around there soon.

I think this is WastedTYouth's photo; either way it's great:

Let us know if you have more questions; it's hard to tell someone's mechanical aptitude in one post.
Robbie
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One-on-one tech help for your vintage Volkswagen:

www.airschooled.com

https://www.patreon.com/airschooled

[PEI Jonny]

Hey Robbie, huge fan! You've got an amazing knowledge of this stuff!
I do have a multi meter, not half as nice as the one your showing. I have read on a couple of other threads that the temp sensor could be the culprit. I will definately check that and get back to you. I'll definately be the first one to tell you I'm not a mechanic, but a decent hobby mechanic?! Thesamba has saved my butt more than a few times.
Thanks again, I'll check that out and getback to you. If the temp sensor was bad, would it be causing this problem?

Jon
_________________
'70 vert
'72 super
'73 std beetle( not running)
74 std beetle ( not running)

[Randy in Maine]

Yes a defective TSII will make that exact symptom. The FI actually thinks the engine is cold and gives it too rich of a fuel:air mixture and thus the blackened plugs.

Make sure the TS II is snugly connected to the head, but don't reef on it as it has pretty fine 10mmx1.0mm threads.

Also inspect the electrical connection to make sure it is 100%. You can also ground out the crimp connection that goes to the engine wiring harness to a known good ground to get you home if needed.

[PEI Jonny]

Well, I went out this evening to take a look at the temp sensor, pulled the lead wire and it fell out of the connector to the EFI wiring harness. I thought it can't be this easy, right? RIGHT! that's all it was! I reluctantly took it for a spin expecting to stall out and die at the first stop sign, but she ran great! So I went a little further smiling ear to ear while I did! Hated to come back to the shop!
Thanks Robbie and Randy, that's what makes this site so valuable! I'm going to order a new temp sensor just to have in case.

Cheers!

Jon
_________________
'70 vert
'72 super
'73 std beetle( not running)
74 std beetle ( not running)

[Randy in Maine]

You have to love the cheap fix. I always keep a spare TSII in my toolbox.

[TomWesty]