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Old 07-21-2010, 12:19 AM
4evermodding 4evermodding is offline
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Default erratic speedo problems HELP

Hi folks please tell what could be the problem, while i'm driving at freeway speeds, and usually in 4 or fifth gear, the speedo start to jump back and forth between 3,000/4,000 rpm what could be the problem, this all happen after i installed the camshaft syncronizer, everything runs pretty smooth, and have been for at least 2-3 weeks, with the exception of the erratic behavior of the speedo, please let me know your inputs.

p.s i have checked for vacuum leaks and any loose connections, and all seem to be okay.
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Old 07-21-2010, 09:48 AM
turbo turbo is offline
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Default Re: erratic speedo problems HELP

okay, two things...

1) at first glance, I thought the thread said "erotic speedo problems", and I was going to suggest you go see a urologist. but, never mind that.

2) you say "speedo" twice in the body of your message and once in the thread title, but then you're talking about RPMs. The RPM indicator is a tachometer, the vehicle speed indicator is a speedometer.

. a) if, in fact, it's the tach that is showing erratic behavior between 3,000 and 4,000 RPM, it may be the tachometer itself, or the wiring going to the tach -- unless you simultaneously hear the engine revving up and down in an erratic fashion...
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2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock
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  #3  
Old 07-21-2010, 11:27 AM
4evermodding 4evermodding is offline
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Default Re: erratic speedo problems HELP

sorry i meant the rpm , also when idle in neutral with e-brake on, i hear sort of like a light rev up and down , very faint but its their, dont know what
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Old 07-21-2010, 01:07 PM
turbo turbo is offline
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Default Re: erratic speedo problems HELP

Hmm.

I don't have a 3.0 engine in my truck, but those symptoms sure sound like the same thing that the 4.0L engines exhibit when there's a vacuum leak.
__________________
2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock
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