No Crank below 40 degrees

TDI Dave

Member
Joined
Apr 13, 2019
Location
Howell, Michigan
TDI
2005 Passat
I have an intermittent no start condition that seems to only occur at temps below 40 degrees. There are no codes stored and all dash lights come on as normal, except it just doesn't crank. I did a manual conversion about 6 years ago and had a Malone stage 1 tune installed at that time. I was assuming it could be something to do with a temp sensor and tried warming up the ones I could find with a heat gun on low heat with zero luck. Once it does start I have never had it act up again until the next morning when it's cold out. Anyone have any ideas?
 

Mozambiquer

Vendor , w/Business number
Joined
Mar 21, 2015
Location
Versailles Missouri
TDI
1998 VW Jetta TDI. 1982 VW Rabbit pickup, 2001 VW Jetta TDI, 2005 VW Passat wagon TDI X3, 2001 VW golf TDI, 1980 VW rabbit pickup,
I have an intermittent no start condition that seems to only occur at temps below 40 degrees. There are no codes stored and all dash lights come on as normal, except it just doesn't crank. I did a manual conversion about 6 years ago and had a Malone stage 1 tune installed at that time. I was assuming it could be something to do with a temp sensor and tried warming up the ones I could find with a heat gun on low heat with zero luck. Once it does start I have never had it act up again until the next morning when it's cold out. Anyone have any ideas?
So it doesn't crank at all when it's cold? Do you have to jump it or what?
 

Vince Waldon

Top Post Dawg
Joined
Apr 25, 2009
Location
Edmonton AB Canada
TDI
2001 ALH Jetta, 2003 ALH Wagon, 2005 BEW Wagon
Because the word "crank" means different things to different people, do you mean that when it's 40F or colder:

- the starter will not turn the engine over

or

- the starter turns the engine over just fine but the engine will not start
 

TDI Dave

Member
Joined
Apr 13, 2019
Location
Howell, Michigan
TDI
2005 Passat
So it doesn't crank at all when it's cold? Do you have to jump it or what?
The problem has nothing to do with the battery, so jumping it has no effect. When this occurs you turn the key and nothing happens. There are no clicks from the starter solenoid. Just silence. Once it warms up a little outside it starts as if there is no problem and will do so all day long. It just seems to happen first thing in the morning when the temps get below 40. On warmer mornings it starts normally.
 

Seatman

Top Post Dawg
Joined
Apr 23, 2010
Location
Scotland
TDI
2014 Skoda rapid elegance 1.6 cr tdi
The problem has nothing to do with the battery, so jumping it has no effect. When this occurs you turn the key and nothing happens. There are no clicks from the starter solenoid. Just silence. Once it warms up a little outside it starts as if there is no problem and will do so all day long. It just seems to happen first thing in the morning when the temps get below 40. On warmer mornings it starts normally.
When it doesn't start try giving the solenoid on the starter a few taps with a hammer. If that works it'll be the solenoid sticking in the cold for some reason. Possibly a bit worn out.
 
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Mozambiquer

Vendor , w/Business number
Joined
Mar 21, 2015
Location
Versailles Missouri
TDI
1998 VW Jetta TDI. 1982 VW Rabbit pickup, 2001 VW Jetta TDI, 2005 VW Passat wagon TDI X3, 2001 VW golf TDI, 1980 VW rabbit pickup,
The problem has nothing to do with the battery, so jumping it has no effect. When this occurs you turn the key and nothing happens. There are no clicks from the starter solenoid. Just silence. Once it warms up a little outside it starts as if there is no problem and will do so all day long. It just seems to happen first thing in the morning when the temps get below 40. On warmer mornings it starts normally.
Ok, that clarifies a bit.
The problem has nothing to do with the battery, so jumping it has no effect. When this occurs you turn the key and nothing happens. There are no clicks from the starter solenoid. Just silence. Once it warms up a little outside it starts as if there is no problem and will do so all day long. It just seems to happen first thing in the morning when the temps get below 40. On warmer mornings it starts normally.
Check and see if you're getting power down to the starter solenoid.
 

TDI Dave

Member
Joined
Apr 13, 2019
Location
Howell, Michigan
TDI
2005 Passat
There was no power ar the starter, so I bypassed the starter circuit from the ignition and it works. So I must need an ignition switch. It's just very odd that it only acts up when it's cold outside.
 

Mozambiquer

Vendor , w/Business number
Joined
Mar 21, 2015
Location
Versailles Missouri
TDI
1998 VW Jetta TDI. 1982 VW Rabbit pickup, 2001 VW Jetta TDI, 2005 VW Passat wagon TDI X3, 2001 VW golf TDI, 1980 VW rabbit pickup,
There was no power ar the starter, so I bypassed the starter circuit from the ignition and it works. So I must need an ignition switch. It's just very odd that it only acts up when it's cold outside.
There would also be the clutch safety relay which would be more likely.
 

RexNICO

Veteran Member
Joined
Sep 17, 2013
Location
South West OH
TDI
2011 Tiguan, 2011 Q7
The problem has nothing to do with the battery, so jumping it has no effect. When this occurs you turn the key and nothing happens. There are no clicks from the starter solenoid. Just silence. Once it warms up a little outside it starts as if there is no problem and will do so all day long. It just seems to happen first thing in the morning when the temps get below 40. On warmer mornings it starts normally.
I had a similar situation (cold weather, morning - turn key and NOTHING) with an Audi of the same era and holding the key in the start position for 20-30 seconds would some times work. And, as illogical as it may seem, putting a jump pack on it would get it to start. Would be interesting to see if it has the same effect it did for me (& others).

One other thing that made this difficult to diagnose, is once it would start on a given day, it was good to start normally for the rest of that day.

I can't recall what the actual fix was, but I'll see if I can find the old posts.
 
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