It's really cold outside and I noticed when I the wts light go's off if I don't crank the engine over right away and it sits for 40 sconds or more it won't fire. I'll crank it nothing then I turn it off then on wts then fires. It seems if I don't crank soon as the light go's off it won't fire like the glow plugs don't stay heated long.
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Glow plugs seem to not stay on long
- Thread starter bdemutis
- Start date
May have a few going bad? In cold weather I'd think you'd want to start the engine as soon as WTS light went out. If you wait they get cold and if you have some bad ones it will compound the issue.
I'm just used to having a 7.3 I guess where the glow plugs stay active for 10 or 5 minutes depending on temperature I think. That's my next project all glow plugs and injectors. Then I'm going to start doing customization.
Will L.
Well-Known Member
The glowplugs in a 7.3 heat the precup a bit more, that's why it handle a longer delay. Certain Mercedes can hand 3-4 minutes of delay at temps that a 6.5 needs immediate fire. All of them will do best when starting right away.
- Staff
- #5
When the light goes out, the glow plugs are no longer being powered, and they begin to rapidly cool. As soon as teh light goes out, you better be cranking it over, or shut the key off and retry to start it.
Ok so it's much different than a 7.3. I know a 7.3 after the wts goes off its still heating the plugs for 5 minutes or more.
- Staff
- #7
You're thinking powerstroke, a 7.3L IDI works very similar to the 6.5. Flip your drivers side visor down, and it should have the starting intructions on it. GM put a label on the drivers side visor telling customers to wait for the glow plugs/wait to start light to go out, and immediately crank the engine. Then the ECM will turn the glow plugs back on. It shuts them off to allow more power for the starter, and as soon as it's running it will turn them back on for a few seconds if needed.
JMJNet
Recruit
The GPs in this truck is only running around 6-7 sec max with some after glow when cold.
Unless, the ECM is reflashed to a higher glow time.
That is why some members added a manual GP override.
The batteries have to be in tip top shape especially in the cold.
Yes, the Die Hard is not much better than any batteries out there.
They are not immune from bad batteries.
Unless, the ECM is reflashed to a higher glow time.
That is why some members added a manual GP override.
The batteries have to be in tip top shape especially in the cold.
Yes, the Die Hard is not much better than any batteries out there.
They are not immune from bad batteries.
great white
Well-Known Member
On obdii trucks glow time is tailored to two things: voltage and temp.
In a nutshell, lower voltage and/or temp will result in longer glow time.
Post start glow is for emissions and idle stability.
Can't speak for how obdi deals with glow time....
In a nutshell, lower voltage and/or temp will result in longer glow time.
Post start glow is for emissions and idle stability.
Can't speak for how obdi deals with glow time....
- Staff
- #12
Same way.
great white
Well-Known Member
- Staff
- #14
GM didn't seem to change much from OBD1 to OBD2 except for going from a removeable PROM to an integrated EEPROM and OBD2 data protocol.