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Re: 94' jeep grand cherokee trans. delays in reverse
Hi ray_c_brown, This pause is determined by a time lag test, and you can check this yourself with a stop watch.Engagement time in "D" range should be a maximum of 1.2 seconds and the engagement time for reverse should be a maximum of 1.5 seconds. So with your vehicle warmed up and assuming curb idle speed is correct set the park brake,make sure ac is off (air cond) shift transfer case to 2H or if it is a NP249 transfer case leave in 4H,put your vehicle into neutral and set your stop watch shift to Drive and record time repeat this a couple of times and do the same with reverse,as you said the delay is with reverse so if it takes longer than 1.5 seconds here are a few things it could be:shift cable adjustment,low line pressure,worn direct clutch, first/reverse brake worn or a worn or damaged overdrive clutch.Hope this helps you good luck :)
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If the jeep just cranks but doesn't start right away, you might have what is known as the 'delayed start check engine light problem'. Make sure the check engine light comes on, in the dash, before cranking. If the check engine light does not come on right away, then you do have the delayed start problem and the jeep ecu needs to be repaired.
if your trans is slipping when driving or if when you shift from park to reverse or drive it has a delay it doesn't necessarily mean the whole transmission is going. Could be something as simple as low or leaking fluid, a solenoid, a gasket...start with a trans service, if there is excessive metal in the pan, then your trans gears are going and you will need an overhaul or reman trans. Reman is cheaper and has a better warranty than an overhaul--faster too.
To check the solenoid internal contact, you'd need to remove the starter and remove the solenoid cover. Inside you will find a brass wheel that contacts the positive battery lug. You can remove the wheel and reverse it and turn the lug 180 degrees, providing new contact surfaces. Seems that you've done just about everything else. You can also use a test light attaching it at different points to find where the actual delay is occurring. Normally security will allow cranking but will not allow starting.
From what I understand the switch bypasses part of the od circut to delay od function slightly in order to eliminate going in and out on hills. I have several conflicting diagrams which show a control module (sometimes). With this limited info, I'd take the cheapest way possible in making a "guess repair", by changing the switch, which may not be making good connection in one position.Other than that, you will need to find a better set of diagrams than I have before going further. In any case, from what youv'e said, I don't believe it's a trans/converter problem but an electrical one.
It sounds like the reverse band is out of adjustment. Three things can cause this, reverse band, front clutch and the overdrive direct clutch. To test the band, drive the truck in manual low up to 25 mph. Then let off, if the transmission doesn't pull the engine down, the band needs adjusted. If the front clutch is the problem, 3rd gear will be act weird too. The only test I know of for the overdrive direct is to inspect it, so process of elimination will have to work. Hopefully the problem is the band, because you can pull the pan, service the trans, adjust the band, and be done. Any of the other problems and you are looking at a rebuild. Good luck.