What does cylinder 4 on a Jeep Wrangler mean?
The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Wrangler has P0304 as well. P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code.
Can a vacuum leak cause a Jeep Wrangler to misfire?
This is definitely not the place to start. Vacuum leak – If your Wrangler has a vacuum leak, it can be very difficult for it to get the right air/fuel mixture. This will cause the cylinders to misfire and it’ll throw the P0304 if the leak is around that specific cylinder on the intake manifold. It’s easy (and kind of fun) to chase one down.
Is there a vacuum leak in the Jeep Cherokee 4.0?
A common problem in the 4.0 jeep engines is vacuum leaks around the throttle body. Here’s the solution I found for the HUGE vacuum leak in my 2000 Cherokee. Category Autos & Vehicles Show moreShow less Loading… AutoplayWhen autoplay is enabled, a suggested video will automatically play next. Up next
How to repair a Jeep Wrangler YJ vacuum schematic?
Fig. 6: Emission control vacuum schematic-1992 with 4.0L engine Access our Jeep Wrangler-YJ 1987-1995 Vacuum Diagrams Repair Guide by creating an account or signing into your AutoZone Rewards account. Once you sign in, follow these instructions to access our Repair Guides. Add your vehicle in Manage My Vehicles.
How to troubleshoot a bad fuel injector in a Jeep Wrangler?
TIP 1: The engine in your 4.0L Jeep Cherokee (Grand Cherokee, Wrangler) needs to be at operating temperature to get an accurate snapshot of the condition of the fuel injectors. TIP 2: If your Jeep doesn’t start, you don’t have to worry about performing the test with a warmed up engine.
How long does it take to test a fuel injector in a jeep?
TIP 2: If your Jeep doesn’t start, you don’t have to worry about performing the test with a warmed up engine. What makes testing the fuel injectors on your Jeep’s 4.0L 6 cylinder engine is that they are in plain view and easy to get to. This makes it possible to check for a bad fuel injector in about 10 to 20 minutes.
What should the resistance of a fuel injector be?
If you’re gonna test them all, probe the #1 fuel injector’s two male spade terminals with the multimeter test leads. Whatever Ohms value your multimeter throws at you, write it down on a piece of paper. The fuel injector resistance should be within 13.3 to 15.7 Ohms (1991-95) or 10.8 to 13.2 Ohms (1996-2001).