'95 Squeaking on Startup
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Postmaster
Joined: Oct 2006
Posts: 4,816
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From: Davis & Newcastle, CA
'95 Squeaking on Startup
I have been experiencing some squeaking/squealing when I start up my truck, very loud. It squeaks only when idling, the squeak goes away when I give it a little gas. The sound is reminiscent of a belt/pulley problem but it is intermittent, doesn't always do it. The belt is in great shape, pulleys are all tight and bearings and good.
I'm not sure if it was a coincidence but it also seems like the times that it HAS squeaked I had started the truck from being cold (hadn't run for a few hours) IN COMBINATION with having the vent on in the cab. Other cold starts without any vent running I didn't get the squeak. If I run the truck for a bit and THEN turn the vent on, no squeak. Anybody have any suggestions?
I'm not sure if it was a coincidence but it also seems like the times that it HAS squeaked I had started the truck from being cold (hadn't run for a few hours) IN COMBINATION with having the vent on in the cab. Other cold starts without any vent running I didn't get the squeak. If I run the truck for a bit and THEN turn the vent on, no squeak. Anybody have any suggestions?
Cargo Master
Joined: Jun 2002
Posts: 2,033
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From: Aurora,Colorado
I would suspect that the spring in the belt tensioner is getting weak or the belt is worn and elongated.
When I changed my tensioner and belt--the truck got real quiet and new sounding again.
When I changed my tensioner and belt--the truck got real quiet and new sounding again.
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Postmaster
Joined: Oct 2006
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From: Davis & Newcastle, CA
I did notice that the tensioner was very easy to move when I removed the belt and also that it was bouncing around quite a bit when the engine was idling. The only thing that made me think it couldn't be the tensioner is that the truck never makes the noise if the engine has been running for a bit, even if the tensioner is still bouncing around. What do you think?
Post Fiend
Joined: Jan 2005
Posts: 8,402
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When you start from cold the starter draws a hefty current from the battery. As soon as the engine fires the alternator loads up to replace the charge in the battery and so puts extra load on the drive belt causing it to slip. Replace the belt and tensioner as already suggested.
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Postmaster
Joined: Oct 2006
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From: Davis & Newcastle, CA
Fantastic. Good call.
One other thing that I should mention. On the same day that I first heard this noise I also got a check engine light about a mile down the road. I later found out that the codes for that light were:
332 (Continuous memory code) - Insufficient EGR flow detected
335 (Key off engine off code) - EGR Sensor Circuit Voltage Higher or Lower Than Expected During Self Test
Both EGR related. I posted another thread about remedying my EGR situation but could the squeal be related to a bad EGR component (sensor, valve, etc.)? Or was this just a coincidence.
One other thing that I should mention. On the same day that I first heard this noise I also got a check engine light about a mile down the road. I later found out that the codes for that light were:
332 (Continuous memory code) - Insufficient EGR flow detected
335 (Key off engine off code) - EGR Sensor Circuit Voltage Higher or Lower Than Expected During Self Test
Both EGR related. I posted another thread about remedying my EGR situation but could the squeal be related to a bad EGR component (sensor, valve, etc.)? Or was this just a coincidence.
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Joined: Jul 2006
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From: South Georgia
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Junior User
Joined: Jan 2003
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From: Detroit Area USA
Just an idea. I had a Ford vehicle recently that would have a high pitch tone only in idle. It wouldnt happen all the time and could be light or very loud at any given time. I give it a little gas and it went away, but would come back when the truck idled down again. I took a screw driver handle and I started tapping around a little under the hood while it was making this sound and found that if I tapped the IAC valve on the side of the intake plenum, I could make the noise disappear, re-appear and change tone. I replaced the IAC valve and the problem went away. Maybe you could try tapping the IAC valve while its making its noise and see if it changes.
Just a thought
Just a thought
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From: Texas
Originally Posted by phoneman91
I would suspect that the spring in the belt tensioner is getting weak or the belt is worn and elongated.
When I changed my tensioner and belt--the truck got real quiet and new sounding again.
When I changed my tensioner and belt--the truck got real quiet and new sounding again.