Hot Starting Issue
Posted: Wed 17 May, 2017 12:01 pm
Hi all,
Im a long time lurker and first time poster.
I've had a 1970 280S for just over a year now and it has developed a fairly bad hot-start issue. It starts fine cold, first time every time, but after a short trip that gets up to operating temperature I can't just hop back in and start it up again. I'll turn the key and there is no response of any kind when I turn the key to position 2 (start) until the temperature returns to just below 40 on the temperature guage. At just above 40 it will crank intermittently (as if a connection is returning somewhere in the primary ignition circuit) but wont crank long enough to fire until the temperature is visibly below 40 on the temp guage.
From loads of reading I have a few suspects.
1. Immobilizer (installed 2005), gets quite hot
2. Neutral Safety Switch (has gone through phases of only starting in Neutral, now only starts in Park)
3. Ignition Switch
4. Pertronix Ignitor I electronic ignition (I only installed it last year December)
5. Coil? Looks original...(hoping to find some wisdom here)
My confusion though, is why it would only occur while the temperature is high.
**Bonus** - If I apply any accelerator while trying a hot start, it will crank but not fire, regardless of how long I crank it.
I've checked and cleaned as many electrical connections as I can without disassembling the dash (currently I dont have a good place to work on the car) and basically am looking for some of the vast wisdom you all have here before I go on to try anything major!
Thanks!
Riley
Im a long time lurker and first time poster.
I've had a 1970 280S for just over a year now and it has developed a fairly bad hot-start issue. It starts fine cold, first time every time, but after a short trip that gets up to operating temperature I can't just hop back in and start it up again. I'll turn the key and there is no response of any kind when I turn the key to position 2 (start) until the temperature returns to just below 40 on the temperature guage. At just above 40 it will crank intermittently (as if a connection is returning somewhere in the primary ignition circuit) but wont crank long enough to fire until the temperature is visibly below 40 on the temp guage.
From loads of reading I have a few suspects.
1. Immobilizer (installed 2005), gets quite hot
2. Neutral Safety Switch (has gone through phases of only starting in Neutral, now only starts in Park)
3. Ignition Switch
4. Pertronix Ignitor I electronic ignition (I only installed it last year December)
5. Coil? Looks original...(hoping to find some wisdom here)
My confusion though, is why it would only occur while the temperature is high.
**Bonus** - If I apply any accelerator while trying a hot start, it will crank but not fire, regardless of how long I crank it.
I've checked and cleaned as many electrical connections as I can without disassembling the dash (currently I dont have a good place to work on the car) and basically am looking for some of the vast wisdom you all have here before I go on to try anything major!
Thanks!
Riley