Double fire off at start question??
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Elder User
Joined: Nov 2005
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Double fire off at start question??
Trying to describe this and it's hard cuz it's audible... lol.
Ok ... when I start my truck ( 1997 F250 7.3L Auto ) usually it's like this :
CRANK - VAROOM - ( engine fires off ) - RUNNING @ IDLE
Now sometimes lately I get like a double firing of the initial startup :
CRANK - VAROOM - (pause for a second )-VAROOM - RUNNING @ IDLE
When you fire off a 7.3 you get that initial RAP well mine is like RAP ( pause ) RAP then idle. Like it's firing off then nothing then firing off again real quick?
Don't know how else to describe it. Any ideas on what causes this?
Ok ... when I start my truck ( 1997 F250 7.3L Auto ) usually it's like this :
CRANK - VAROOM - ( engine fires off ) - RUNNING @ IDLE
Now sometimes lately I get like a double firing of the initial startup :
CRANK - VAROOM - (pause for a second )-VAROOM - RUNNING @ IDLE
When you fire off a 7.3 you get that initial RAP well mine is like RAP ( pause ) RAP then idle. Like it's firing off then nothing then firing off again real quick?
Don't know how else to describe it. Any ideas on what causes this?
Mountain Pass
Joined: Mar 2003
Posts: 144
Likes: 0
From: LaFargeville, New York
Originally Posted by Brians97F250Crew
Trying to describe this and it's hard cuz it's audible... lol.
Ok ... when I start my truck ( 1997 F250 7.3L Auto ) usually it's like this :
CRANK - VAROOM - ( engine fires off ) - RUNNING @ IDLE
Now sometimes lately I get like a double firing of the initial startup :
CRANK - VAROOM - (pause for a second )-VAROOM - RUNNING @ IDLE
When you fire off a 7.3 you get that initial RAP well mine is like RAP ( pause ) RAP then idle. Like it's firing off then nothing then firing off again real quick?
Don't know how else to describe it. Any ideas on what causes this?
Ok ... when I start my truck ( 1997 F250 7.3L Auto ) usually it's like this :
CRANK - VAROOM - ( engine fires off ) - RUNNING @ IDLE
Now sometimes lately I get like a double firing of the initial startup :
CRANK - VAROOM - (pause for a second )-VAROOM - RUNNING @ IDLE
When you fire off a 7.3 you get that initial RAP well mine is like RAP ( pause ) RAP then idle. Like it's firing off then nothing then firing off again real quick?
Don't know how else to describe it. Any ideas on what causes this?
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
try letting you glow plugs warm up longer. what temps are you seeing right now. mine does that when its cold. i have heard people call it the romps. let you glow plugs warm for about 30 seconds longer and i bet it won't do it.
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walt1968 ... yea I was thinking cam sensor going out too but I'm not sure. I will have to check switch operation too.
tjbeggs ..... It doesn't do it like first thing in the AM. It's after it gets fully up to operating temp then cools off halfway or almost to cold mark. Temps here in FL are low 80's mid 70's. Seems to happen in the middle though between normal operating temp and cold.
79-f250custom.... naa it's not tired... lol. I don't have to crank it over twice. It fires off twice in a row. BAM, BAM then idles fine.
tjbeggs ..... It doesn't do it like first thing in the AM. It's after it gets fully up to operating temp then cools off halfway or almost to cold mark. Temps here in FL are low 80's mid 70's. Seems to happen in the middle though between normal operating temp and cold.
79-f250custom.... naa it's not tired... lol. I don't have to crank it over twice. It fires off twice in a row. BAM, BAM then idles fine.
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