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Need some idle numbers pls to reset my needles

camshaft

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camshaft Enthusiast

camshaft

Posted
Posted

So I had a guy come and replace the stepper motors (all 6) in my guage cluster as the speedo one had died. After the replacement, I noticed a few are off.

 

My tach shows Im idling in park at 400 rpm and at 70mph shows 1900. I suspect these are about 200 rpm low on both as I seem to recall sitting right about 2100 previously at that speed.

 

My speedo is also showing a few mph slower than I am actually going as per the speedo.

 

Can anyone with an old style gm/chev, with same engine/rear let me know what your idle speed is in park and at 70mph pls. I just want to get my numbers confirmed for when the guy comes to readjust the needles.....

 

Thx very much

GasHog369 Senior Enthusiast

GasHog369

Posted
Posted

I'd probably look into going to a local speedshop and have them hook the computer up to it and get the exact #'s...

 

Id imagine everyones truck will be different, especially with the rpms.

 

If it was a brand new truck , you could go off someone elses, but not an older vehicle.

EX-F150 owner Enthusiast

EX-F150 owner

Posted
Posted

Yep. and if your truck has an OBDII port you should be able to do this yourself. Just need a scan tool

camshaft Enthusiast

camshaft

Posted
  • Author
Posted

My scantool wont. The idle/rpm numbers should be fairly consistent for thrucks from that era given engine/tranny/ and rear end are the same....

 

Was hoping someone with an 05 could chime in with the same configuration as mine though

EX-F150 owner Enthusiast

EX-F150 owner

Posted
Posted

Maybe you could check with AutoZone and see if the one they use does. Also, I don't see where you've given any info on your truck for someone to be able to tell you what theirs reads. I could be blind lol :dunno:

camshaft Enthusiast

camshaft

Posted
  • Author
Posted

Sorry. I had it in the topic title but its pretty hard to see.

 

05 Sierra 1/2 ton crew. 5.3, 4speed, 4.10's

 

We dont have autozone up here unfortunately.

Thx Allen, that would be awesome

GPSilverado Enthusiast

GPSilverado

Posted
Posted

Sorry. I had it in the topic title but its pretty hard to see.

 

05 Sierra 1/2 ton crew. 5.3, 4speed, 4.10's

 

We dont have autozone up here unfortunately.

Thx Allen, that would be awesome

 

 

What size tires? That makes a huge difference in the 70 mph rpm read. Even though mine is a newer style, the read at 70 should be exactly the same if the tires are the same diameter. (4.10's as well). The problem to me is that you can't be sure that 70 is really 70 on your speedo either. If one is off, couldn't the other be off as well? Maybe use a GPS to verify that as well.

allen1090 Enthusiast

allen1090

Posted
Posted

I'm back, Idle seemed to hover right around 570rpm on the scan gauge.

 

I never knew crewcabs came with 4.10s.

Seems I have the same truck as you but only with 3.42s

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