Bad sensor/switch with no code?
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Senior Member
Joined: Oct 2001
Posts: 504
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From: reidsville,nc,usa
Car: 1989 Firebird Formula 350
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 9 Bolt Borg Warner 3.27 gears
Bad sensor/switch with no code?
I was reading a post I did about 4 years ago which is related to what is going on now. At that time, I used to tach 1750 at 55 mph then it gradually went to 2000 rpms at 55 mph. Now at 55 mph, I tach at 3000! Can a sensor or switch go bad without the ECM throwing a code? I have replaced the IAC,TPS,MAP,ECM. The only things I have'nt replaced is the knock and vss sensors. I went down the road and the tranny shifts smooth and soft with no downshifting on its own and no hard knocks. Cat clogged and or tcc maybe? Its getting very annoying?ANY HELP!!!
Ken
Ken
Supreme Member
Joined: Nov 2002
Posts: 1,832
Likes: 1
From: Castaic, CA
Car: 1988 Camaro RS
Engine: 2.8L of Raw POWER!!!
Transmission: Stick Shift
Axle/Gears: 3.42's
Re: Bad sensor/switch with no code?
THe only thing that can change your engine speed to road speed ratio is effective gearing. Now I say effective because you might have a TCC that's not working and there is no code for that. If it's something that gradually happened, I'd say it's a general transmission issue with the clutches and bands inside the trans going kaput and slipping, gradually getting worse.
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