Lazy tachometer
Thread Starter
|
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Lazy tachometer
Just this week my truck started doing something weird. I first noticed it on Tuesday but then I wondered if I was just seeing things because I could not duplicate the symptom again. Didn't drive that truck yesterday but this morning same thing happened.
At first start, the engine fires normally yet the tach needle rests solidly at zero for about 15 seconds, then it pops to life. I shut the truck off and restarted the engine a few times and the needle responds normally. So far today it's been normal....just the first start of the day has the weirdness.
Has anyone seen anything like this before? What could cause this issue?
At first start, the engine fires normally yet the tach needle rests solidly at zero for about 15 seconds, then it pops to life. I shut the truck off and restarted the engine a few times and the needle responds normally. So far today it's been normal....just the first start of the day has the weirdness.
Has anyone seen anything like this before? What could cause this issue?
Thread Starter
|
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
It just seems odd that it only happens on the first start in the morning....I suppose it's temperature related. Temps here in the morning are in the 70's so maybe the symptom will worsen the colder it gets...
I have a spare instrument cluster somewhere...I'll try and dig it out to see how the needle functions. I presume there is a counterweight that reacts to a magnetic field but I am only guessing since I've never looked at the gauges that closely.
I have a spare instrument cluster somewhere...I'll try and dig it out to see how the needle functions. I presume there is a counterweight that reacts to a magnetic field but I am only guessing since I've never looked at the gauges that closely.
Laughing Gas
Joined: Jul 2012
Posts: 856
Likes: 63
From: Los Angeles/Ventura, CA
Just this week my truck started doing something weird. I first noticed it on Tuesday but then I wondered if I was just seeing things because I could not duplicate the symptom again. Didn't drive that truck yesterday but this morning same thing happened.
At first start, the engine fires normally yet the tach needle rests solidly at zero for about 15 seconds, then it pops to life. I shut the truck off and restarted the engine a few times and the needle responds normally. So far today it's been normal....just the first start of the day has the weirdness.
Has anyone seen anything like this before? What could cause this issue?
At first start, the engine fires normally yet the tach needle rests solidly at zero for about 15 seconds, then it pops to life. I shut the truck off and restarted the engine a few times and the needle responds normally. So far today it's been normal....just the first start of the day has the weirdness.
Has anyone seen anything like this before? What could cause this issue?
Thread
Thread Starter
Forum
Replies
Last Post
LARIAT 85
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
Apr 17, 2009 09:33 PM
puller45
1999 - 2003 7.3L Power Stroke Diesel
3
Dec 6, 2008 05:47 PM
