On my 94 Pathfinder SE V6 Automatic yesterday I noticed while driving the RPM Needle jumped up to Redline then back down then it did it again and again it did it a bunch of times then it would jump halfway then go back down and do it a bunch of times then it would go dead for a while and then start going crazy again then it would work normal for a while then start jumping and going crazy again. It's been doing this the past few days. The only thing I did before it was happening was gave a VW a jump and had an Oil Change. So if you could please Help and give me some suggestions I'd REALLY appreciate it! Thanks in Advance.
You may have fried something in the ECU. Check the wiring to the distributor.
February, 19, 2012 AT 5:17 AM
Ok thank you very much!
February, 19, 2012 AT 5:23 AM
So if I did fry something what needs to be replaced? The ECU or the Distributor or Both and how will I be able to tell? I'm wondering if it has something to do when I jumped that car?
February, 19, 2012 AT 5:42 AM
Most likely the ECU, unfortunately. Pay special attention to loose grounds and connections. There's also a control module under the right front seat. The grey wire there feeds the tach.
February, 19, 2012 AT 7:27 AM
Ok thanks again!
February, 19, 2012 AT 9:47 AM
My pleasure. Let us know what you find out and tell your friends about us!
February, 19, 2012 AT 10:40 AM
Ok sounds good I hope I can figure it out and I always tell my friends how Professional you guys are!
February, 19, 2012 AT 9:08 PM
The tach signal comes from a couple of sources. There's a crank position sensor in the distributor, and the negative, or tach side of the coil. Those feed into the control module I mentioned above, which generates the signal to the tach.
February, 20, 2012 AT 2:29 AM
Ok I'm not to Mechanically inclined so I'll have to wait for a Buddy of mine to check it out thanks again!