Jeep wont start in the morning
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Senior Member
Joined: Aug 2009
Posts: 674
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From: McCall Idaho!
Year: 97
Model: Grand Cherokee
Engine: 5.2
yea no i have plunty of fuel it sprays like mad.... I changed the cps nothing happen but now im not getting spark out of my coil..... could that be related to the cps? Because the cps i used was off a 91...
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Joined: Nov 2010
Posts: 5,840
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
BUT HAVE YOU TRIED THIS! If not, why not? It is a quick test that can help you here. If it helps, you have pressure drop. if it doesn't, the problem lies elsewhere
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Try the "poor mans prime" to help you confirm this. It is an easy quick and dirty test that can tell you a lot...............
1. Turn key to ON position (do not crank the engine!). The fuel pump will energize and run for approx. 2 seconds, then turn off.
2. Repeat the above twice more
3. NOW try to start the engine. If the engine starts quickly using the above technique, you have VERIFIED that you have fuel pressure drop.....then
you would need to figure out where. Could be leaking back due to a checkvalve problem on the pump, but theoretically the pressure can drop anywhere between the tank and the injectors.
-----------------------------------------------------------------
Try the "poor mans prime" to help you confirm this. It is an easy quick and dirty test that can tell you a lot...............
1. Turn key to ON position (do not crank the engine!). The fuel pump will energize and run for approx. 2 seconds, then turn off.
2. Repeat the above twice more
3. NOW try to start the engine. If the engine starts quickly using the above technique, you have VERIFIED that you have fuel pressure drop.....then
you would need to figure out where. Could be leaking back due to a checkvalve problem on the pump, but theoretically the pressure can drop anywhere between the tank and the injectors.
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