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Volkswagen Rabbit, Jetta, Scirocco, Convertible: 1975-1984 (A1) 1982 Jetta won't idle when cold


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Last Post: Oct 10, 2013 12:12 AM Last Post By: MDeath
MDeath

Posts: 102
Registered: 06/17/05
1982 Jetta won't idle when cold
Posted: Jun 4, 2013 4:15 PM
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1982 Jetta will not idle when cold, when you first try to start it up. after it warms up it runs pretty much okay.

gas engine, auto transmission : (

where should I start looking?

thanks in advance
Giff

Posts: 4
Registered: 06/04/13
Re: 1982 Jetta won't idle when cold
Posted: Jun 4, 2013 9:41 PM   in response to: MDeath in response to: MDeath
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I'd start with checking vacuum lines
Then test the cold start valve
If you have a Bentley the procedure is in there
Good luck
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Jun 5, 2013 10:13 AM   in response to: Giff in response to: Giff
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I think it is vacuum lines too. At least I hope it is. I start there and post back, thanks!
FKH161

Posts: 7,610
Registered: 12/29/05
Re: 1982 Jetta won't idle when cold
Posted: Jun 5, 2013 2:08 PM   in response to: MDeath in response to: MDeath
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On CIS Injection you always want to check cold & warm control pressure... could be an issue with the warm-up regulator.
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Jun 5, 2013 2:29 PM   in response to: FKH161 in response to: FKH161
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yes, thanks! I will check it too - also I know I have a used working one so if it is that I'm ready!

AWEsome video btw. Thanks so much!

Edited by: MDeath on Jun 5, 2013 2:37 PM
tcovenant2000

Posts: 1,763
Registered: 12/09/03
Re: 1982 Jetta won't idle when cold
Posted: Jun 6, 2013 7:53 AM   in response to: MDeath in response to: MDeath
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An easier test is the Lambda temp switch. This tells the computer that the car is cold and to ignore the O2 sensor. Let car sit overnight. Unplug the O2 sensor. If the car now starts and idles well then the lambda temp switch is suspect. You can test the switch itself. Let car sit overnight. Measure resistance across the switch. It should be close to zero ohms. If not, switch is bad.

Thomas
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Jun 6, 2013 10:07 AM   in response to: tcovenant2000 in response to: tcovenant2000
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thanks, Our Thomas. This is something I can easily do. I will try it this weekend.
tcovenant2000

Posts: 1,763
Registered: 12/09/03
Re: 1982 Jetta won't idle when cold
Posted: Jun 6, 2013 6:19 PM   in response to: MDeath in response to: MDeath
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It's an '82. The lambda temp switch should be located on a pipe that runs between the end of the engine on the driver's side and the clutch. The pipe runs from the engine toward the firewall. The switch is unique in that it has two wires, but they are on separate, plastic connectors.
If that don't fix it, let me know. I've a few other easy tests you can try. Do you have a dwell meter or a duty-cycle meter?

Thomas
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Jun 6, 2013 7:14 PM   in response to: tcovenant2000 in response to: tcovenant2000
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no I don't..but the guys at the shop surely do. so if you don't mind, give me the barrage of tests and I can pass it along.:^0
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Jul 29, 2013 1:28 PM   in response to: MDeath in response to: MDeath
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okay, things have def taken a turn for the worse: changed the fuel filter, air filter and checked all the vac lines. It still did the same thing only not quite as bad. Then this morning it just cut off at a stop light and now it turns over but it wont catch. There is no buzz when you turn the key either. when we checked the coil it was positive on both sides! I never even knew that was possible!
If it wasn't weird it wouldn't be happening to me. I say its the fuel pump, but my guy says it's a "wieid electrical problem" which just confuses me because everything else electrical is fine: lights, wipers, etc.
Aren't I right to say fuel pump?:0
tcovenant2000

Posts: 1,763
Registered: 12/09/03
Re: 1982 Jetta won't idle when cold
Posted: Jul 29, 2013 5:47 PM   in response to: MDeath in response to: MDeath
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At this point (no start) you need to verify if you have:
Spark
Fuel pressure
Correct Static Timing.

Spark is easy. Pull out a plug and crank and check for spark (FWIW I keep my old plugs in trunk, so I have one handy and can hook it to the wire and test).
Correct static timing is fairly easy. Haynes or Bentley or search of this forum can help.
Fuel pressure means you're going to need a gauge.

Cabby-info.com has info on static timing and making/using a fuel pressure jig.

Thomas
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Jul 30, 2013 12:40 AM   in response to: tcovenant2000 in response to: tcovenant2000
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Thanks our Thomas. I'll keep yall posted. Work resumes in the morning...
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 3, 2013 2:19 PM   in response to: MDeath in response to: MDeath
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My Dude was right. It WAS a weird electrical issue: The coil wire was bad which burned out the ICM. Replaced the coil to distributor wire. New ICM arrived last night, put it in this morning. boom. started right up. I have a feeling this fella eats these things so I am keeping a spare. At least I won't be stranded somewhere. Now off to go find my marble......:^0
tcovenant2000

Posts: 1,763
Registered: 12/09/03
Re: 1982 Jetta won't idle when cold
Posted: Aug 4, 2013 10:08 AM   in response to: MDeath in response to: MDeath
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Wow...good call! Glad to hear you fixed it!

Thomas
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 4, 2013 11:50 AM   in response to: tcovenant2000 in response to: tcovenant2000
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Thanks, Our Thomas, and everyone for sticking with.

But stay tuned, Kids!! More Weird Tales of the MK1 Jetta coming soon!!!!! :x
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 29, 2013 8:22 PM   in response to: MDeath in response to: MDeath
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Attachment DSCF2143lge.jpg (391.8 KB)
And, we're back. There is a bit of confusion on this end over the difference between the lambda temp sensor and the coolant temp sensor. can anyone maybe post up a pic of the lambda sensor/location.
and what is this? (see pic)
I got people arguing that I do have a coolant temp sensor and that I don't have one. I'm about to throw a brick...
FKH161

Posts: 7,610
Registered: 12/29/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 29, 2013 9:13 PM   in response to: MDeath in response to: MDeath
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That's the cold start valve thermo switch.... the lambda temp sensor is in one of 2 locations:

1) in the flange under the cold start valve thermo switch (i don't see it in your picture)
2) in the coolant flange / hose at the side of the cylinder head
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 29, 2013 9:19 PM   in response to: FKH161 in response to: FKH161
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I don't see it either..I'm thinking I just don't know what I'm looking for..I could really use some kind of pic - anyone? It's not possible to not have one, right?
FKH161

Posts: 7,610
Registered: 12/29/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 29, 2013 9:22 PM   in response to: MDeath in response to: MDeath
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If you have an O2 sensor, then you should have a lambda temp sensor.

No O2, no sensor.
MDeath

Posts: 102
Registered: 06/17/05
Re: 1982 Jetta won't idle when cold
Posted: Aug 29, 2013 10:15 PM   in response to: FKH161 in response to: FKH161
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ayee yah! time for a pint

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