check engine light came on and speedo stopped working @ the same time.

40505 Views 14 Replies 12 Participants Last post by Andyk, Oct 14, 2013

eric

Discussion Starter · Apr 16, 2006

'99 4.0 . I'm wondering if anyone else has had a simalar problem? I had a local shop put a new clutch in it for me recently and am now having some regrets.I'm not sure, but I have been thinking that they may have damaged the wiring going to the speed sensor, although I can't find any visable damage. I put my friend speed sensor from his tj into mine in an attemt to find out if my sensor was bad (did'nt help any) and now his jeep does the same thing. did my computer break his sensor? Is there some sort of computer reset that i'm unaware of? apart from the engine light and not having a working speedo, my jeep now stalls when coming to a stop and the cruise control won't work. any ideas? thanks.

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Jerry Bransford

· #4 · May 9, 2006

The speedometer gear housing must be rotated properly so the speedo gear properly engages its pinion gear. It's possibly nothing more than that. There are certain positions the housing must be at depending on the speedometer gear tooth count so count the teeth and rotate the housing so it is lined up properly. You'll find the tooth count ranges on the housing so just line up the housing to match what is indicated. Even when pointed at the right index mark, you may still have to rotate it a bit more to get the gear to engage properly.

And when the speedometer doesn't work from this problem, a Check Engine light will result.

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