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1990 Wrangler 4.2L Timing Help

20K views 41 replies 14 participants last post by  hubb6666 
#1 ·
I just purchased a 1990 Jeep Wrangler with the 4.2L 258 engine. It has the Offenhauser Intake Manifold with the Holley 390CFM 4 barrel carburetor and headers. I also noticed that the "Nutter" bypass has also been done. My problem is the jeep runs terrible and had to tow it from the persons house that I bought it from. I tried checking the timing but either my timing light is reading wrong or maybe the timing chain is off. I disconnected the vacuum advance and plug it. When I take a reading my timing light is not showing the mark at all. I have to advance my timing light to 45 degrees to see mark at 0 degrees. I tried contacting the guy that sold me the jeep to see if it has ever run after he put all this stuff on and to see if he has messed with the timing chain but no luck. I looked at the timing chain cover and there is a new gasket on it. Can anyone lead me in the right direction on what steps to take next? Thanks
 
#37 ·
The heater hose that you have connected to the water neck should be connected to the rear of the intake manifold and then you should connect a 5/8" heat hose from the waterneck to the front of the manifold.
 
#39 ·
I know it's tight. I bought 8 feet of 5/8" yesterday because the hose from the waterneck to the manifold is the one that I took with me to NAPA and was going to replace all of it. Turns out that the hose from the heater core back to the water pump needs to be bigger...didn't check the other connection from the core to the back of the manifold yet but I know that the5/8' will go on the manifold to water neck:2thumbsup:.
 
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