[V8] Testing RPM Sensor

[Tony and Lillie]

The tach bouncing means no spark signal. Now, as to why, as Steve said, pull 
codes. Easy enough, and will save you time and $$$.

If you find the RPM sensor bad, here's some advice. First, replace them 
both. It's easy enough, and cheap insurance. Next, if you plan on keeping 
the car, and you want the job easier next time, use 5000 Turbo sensors. They 
have a longer pigtail, and you can relocate the bracket to the firewall, 
rather than where it is right now - you'll see.

Oh, the resistance should be right around 1000 ohms. I believe that is 
between the two outer terminals, but it's been a while.

Tony Hoffman

----- Original Message ----- 
Subject: Re: [V8] Testing RPM Sensor


> ... codes???
>
> I believe the manual has some resistance values ... I've never tried
> that method, nor would I make the call based on whether or not the tach
> bounces ... in many cases the situation is obvious from the symptom.
> Has the car had hot start or stalling symptoms in the past?  There are
> many things that can lead to a cold no start ... fuel pump was bad for
> me once ...
>
> Steve B
> San Jose, CA (USA)
>>
>> I put some time into diagnosing my V8Q no spark issue today.