Bogging down - Page 4 - JeepForum.com
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post #46 of 203 Old 09-19-2013, 07:47 PM Thread Starter
lander2312
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Q will be happy i set up to borrow a fuel pressure gauge tomorrow...or Sunday so i will report back what the readings are.
You guys are great. I wish i knew half of this stuff...but I am learning,,,,,ahhhh and weekend garage mechanics get to drink beer too!

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post #47 of 203 Old 09-19-2013, 07:50 PM
Luuca
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Originally Posted by Que89YJ View Post
Luuca you can rent the tool you don't even need to buy it. I think the pressure is high too. There have been at least a half dozen in the last couple month's with return line issues because of pinched lines and warped tanks. One guy took out 2 New regulators before I talked him through the pressure test. The symptom sounds like a fuel issue. The engine sounds like it's flooding. The tps is used by the ECU along with the map sensor to figure out injector dwell so I am not ruling it out but it usually fails by giving you a flat spot. The bogging down the way you describe it sounds like you are getting too much fuel.

One other thing for fuel that happens many times is an exhaust manifold leak that causes the o2 sensor to think the jeep is running lean and the ECU with dump fuel to protect the engine. It never usually gets bad enough to cause it to big down to the point of losing power but the difference is very noticeable. Hope the tps does it.
I defer to you on all things. That's not lip service, that's based upon your experience and history solving issues. I think he should check the fuel pressure. It's easier than testing the TPS for damn sure.

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post #48 of 203 Old 09-19-2013, 07:53 PM
Apollo12227
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Originally Posted by Luuca View Post
I defer to you on all things. That's not lip service, that's based upon your experience and history solving issues. I think he should check the fuel pressure. It's easier than testing the TPS for damn sure.
Hear Hear.

Thanks for everything through the years Que.
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post #49 of 203 Old 09-19-2013, 08:10 PM Thread Starter
lander2312
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Originally Posted by Luuca View Post
I defer to you on all things. That's not lip service, that's based upon your experience and history solving issues. I think he should check the fuel pressure. It's easier than testing the TPS for damn sure.
We will know hopefully tomorrow.
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post #50 of 203 Old 09-20-2013, 08:05 PM Thread Starter
lander2312
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Ok i have the gauge and about to test the system...going to try and look up where the vacuum line to the pressure regulator is located and what it looks like on the 2.5....I wasnt kidding when i say I am an idiot on this stuff...lol
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post #51 of 203 Old 09-20-2013, 08:28 PM Thread Starter
lander2312
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Also if it matters i have noticed that when first starting that it isnt firing off and turning over as quick as it use to....takes a few extra second for it to start?
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post #52 of 203 Old 09-21-2013, 12:19 PM Thread Starter
lander2312
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OK plug I plug in the fuel pressure gauge and it reads nothing.....so i triple check my connection and its good but still reads 0. I try to start the jeep and just like what has started to become more and more difficult it just doesnt want to start. Its turning over fast enough...the starter is good just doesnt want to start. I finally get it to fire up and its running 20psi on the gauge. As soon as I cut it off it drops right back to zero.
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post #53 of 203 Old 09-21-2013, 12:22 PM Thread Starter
lander2312
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Also its reads about 10psi when i turn the key over before i even attempt to start it....but as soon as the fuel pump stops running it drops back to zero
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post #54 of 203 Old 09-21-2013, 12:54 PM
Que89YJ
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That is either s bad tool or tells you your fuel system is real bad.
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post #55 of 203 Old 09-21-2013, 12:56 PM
Que89YJ
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I would hook your guage up to another car and check out the readings to make sure.
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post #56 of 203 Old 09-21-2013, 01:01 PM Thread Starter
lander2312
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Unfortunately I think the gauge is working properly.....I will double check it on another vehicle but lets assume that its the fuel system....so where do i go from here?...it is running around 20-22psi while running but it drops to zero as soon as cut off. Also the hard to start is soo hard after it has run for a few min....i cut it off and waited for a fe w min and it started back easier the second time if that helps any?
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post #57 of 203 Old 09-21-2013, 01:07 PM
Apollo12227
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Originally Posted by lander2312 View Post
Also its reads about 10psi when i turn the key over before i even attempt to start it....but as soon as the fuel pump stops running it drops back to zero
All of those readings are far too low. New fuel pump. It should run higher than that when the vehicle is running, somewhere around 30 if I remember correctly, and when you turn off the heep, it should NOT drop to zero. This fuel pressure is pretty much guarenteed to be your problem.

You need a new fuel pump.

Make sure your return line isn't crushed between the tub and crossmember in the back. As your body mounts wear down, the tub crushes the return line, causing the pump to burn out. There is a hose going from your tank to your fuel filter then to your fuel rail into the engine. There is a return hose that goes back to the tank with the excess fuel. They go between the crossmember and tub towards the tank when the lines go from metal to rubber.

When my pump went bad it caused the following symptoms:

1. Had to crank forever for it to start.
2. No power what-so-ever, couldn't even burn out. Could "get around" but no power at all.
3. Slugish and stumbling at highway speeds.

Here is my thread on a similar issue:
http://www.jeepforum.com/forum/f12/j...nt-get-995300/
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post #58 of 203 Old 09-21-2013, 02:07 PM Thread Starter
lander2312
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Yeah I def have some body mounts that are rotted out and need replacing. Actually was hoping to replace them with a 1inch body lift and all new hardware in the near future. I will def check for the pinched line. I hear the pump kick in and it sound good and strong.....it might be a pump impeller issue...

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post #59 of 203 Old 09-21-2013, 02:12 PM Thread Starter
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All is there any test to run to know which one is bad ( either a leaking injector or bad fuel pump) also my gauge says not to use on flex fuel systems and both my dodge and Toyota are flex fuel so no way to double check the gauge today.

"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."

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post #60 of 203 Old 09-21-2013, 02:32 PM
Apollo12227
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Originally Posted by lander2312 View Post
All is there any test to run to know which one is bad ( either a leaking injector or bad fuel pump) also my gauge says not to use on flex fuel systems and both my dodge and Toyota are flex fuel so no way to double check the gauge today.
The sound of the pump isn't really an indication of performance. I have replaced my pump twice now (on my 3rd pump), the first time it went bad, it sounded normal, the 2nd time, it was way louder than normal.

Anyways. Fuel pressure that low was 100% the fuel pump in my case. I don't like making guarentees, so I won't guarentee you it is the pump in your case, but it sure is where I would put my money... It really isn't very hard to replace, only takes an hour or two if your fuel tank is low (tank is much easier to handle if it isn't full of fuel).

I think you need to replace your pump friend... That fuel pressure is a no-go.

>>HERE<< Is a writeup on fuel pump replacement.

Or click on the link to the right :: http://www.jeepforum.com/forum/f12/1...moval-1167482/



On a seperate note. In order to see if my return line was pinched, when I had the tank dropped and the return line unhooked, I tugged on the return line from both sides of the cross member and sure enough, I couldn't make the return line hose budge, it was pinched between the rear crossmember. Upon removal, it was quite literally crushed in half.
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