Rough Idle
Elder User
Joined: Dec 2002
Posts: 624
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From: Georgia
The Haynes manual has a procedure for checking the codes on the OBD-I systems without a code reader.
I think the way you check the modulator is to pull the vacuum hose off and look for tranny fluid in the tube. Are you loosing any fluid?
I think the way you check the modulator is to pull the vacuum hose off and look for tranny fluid in the tube. Are you loosing any fluid?
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
Yes, but a code reader is recommended for several reasons.
1: it is easier to use, and foolproof.
2: it beeps, so the codes are now audible
3: you cannot perform a wiggle test without one (just in case you ever had an intermittent sensor)
4: it is difficult to perform a cylinder balance test without a code reader.
I have a code reader, and wouldn't go back to the jumper method (EVER). It just plugs in, and has a switch on it to activate it.
1: it is easier to use, and foolproof.
2: it beeps, so the codes are now audible
3: you cannot perform a wiggle test without one (just in case you ever had an intermittent sensor)
4: it is difficult to perform a cylinder balance test without a code reader.
I have a code reader, and wouldn't go back to the jumper method (EVER). It just plugs in, and has a switch on it to activate it.
Posting Guru
Joined: Jul 2004
Posts: 2,416
Likes: 1
From: Mitchell, SD
Originally Posted by Fordboy49
Hi Khantyranitar,
Whioch code reader is best for OBD-1?
Thank you,
Fordboy49
Whioch code reader is best for OBD-1?
Thank you,
Fordboy49
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
I have an actron brand, but most of them should work fine. I recommend the Atron on this one, because the manual is very complete, the price is right, an it has the audio beep feature.
Freshman User
Joined: Aug 2004
Posts: 36
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Disregard checking the modulator. I climbed under the van Saturday and couldn't find it. I went to the parts store and had him pull one so I knew what it looked like. I climbed back under the van and I can now say that my van doesn't have a modulator. The transmission mechanic stated that only half of the 95's had modulators so mine must be a later 95. I will check to see if I have back pressure in the fill tube. Thanks for your help.
