Tune Up / Vacuum Check ?

[cferry7]

1989 Toyota Pickup DLX, 4 cylinder 2.4 L , 4WD , 22RE , EFI

Hello -

Yes, I am relatively new to this Engine.

Can not find a Main Vacuum Line to hookup Vacuum Guage to for a Overall Engine Intake Vacuum Test ???

Where is a Good Hookup Point for my 2 wire Tachometer for Test Purposes ??

 

[mikesmith140]

I'm not sure what a "2 wire tachometer" is, but I use a timing light with the RPM readout to check my RPM when I'm doing the timing or adjusting idle RPM. I'd suggest getting one of those, they're pretty handy.

 

[cferry7]

Tachometer

Thanks for Reply.

My two wire Tachometer is a section of a small Engine Analyzer which is composed of a Tachometer, Dwell Meter and Voltmeter.
The two wires of Tachometer are Ground connection and Positive Tach connection.

On many older other vehicles their exists a Tach connection coming off the distributor . . .

IS THEIR A TACH Connect within the Little Diagnostic Electrical Test Point Box on the Right Side of the Engine Compartment Cowl which sits just above the passenger front shock absorber mount ???

 

[mikesmith140]

My '86 is a little different from yours, I don't have something like that. What I do have is a Factory Service Manual (FSM) that I purchased off of e-bay or Amazon. It's been a great help, like today I replaced my faulty TPS (throttle position sensor), it had all the info on how to test it and adjust it. They're expensive, $85-120, but it's saved me quite a bit in time AND money : )

Mike

 

[flyinhawaiian01]

Here's the pin layout for the diagnostic connector under the hood:

Toyota old diagnostic connector pinout diagram @ pinoutsguide.com

There is a pulsed negative output for ignition, that might work but I can't say for sure, not sure what your analyzer is looking for, + or - signal.

Oh yeah, there's FSM's all over the place for download, search around in this forum and you'll find the links for them.

 

[cferry7]

Thanks "mikesmith140" and "flyinhawian 01" !

I will give the "Ignition Pulsed Output IG- Signal
a try with my multimeter first, ( understanding that this may be a negative polarity Signal ), then possibly to my tachometer.
I appreciate the Diagnostic Connector Layout !

I feel the Truck is in pretty good shape for 220 K miles - recently this Summer completed ***
(1) Compression Test (2) Spark Plug's New (3) Valve Adjust (4) Cleaned Throttle Body Intake.
Yes, I need to do the TPS Adjust and Clean procedure more thoroughly - - I've seen on threads that this style Engine loves much attention in the TPS and Throttle Body areas !

 

[cferry7]

IG- signal

I placed my Craftsman 82139 multimeter on the Frequency / % Duty Cycle selection reading scale. Positive multimeter lead on the "IG-" test point within the Trucks Diagnostic Connector, Negative lead on Neg. Battery Terminal post.
The Frequency Readout was 24 Hz at Low Idle and increased proportionally up to >100 Hz at Higher acceleration.
This definitivly clarifies the earlier post reply concerning the "IG- Signal" relationship to Tach / RPM reading !

Next 1 : A math equation interpolation to use my Craftsman Multimeter (as above) to correlate Frequency to RPM using the IG- test point.
Next 2 : Possibly take the risk of hooking up my
Tachometer / Small Engine Analyzer to the " IG- signal " test point.

 

[cferry7]

Tach Test Point

Whola Whola

The best positive Tachometer Lead connect point on this Truck is the Negative Ignition Coil Terminal ! Tachometer Negative Lead connect to Battery / Chassis Ground !