1998 Hesitates, chugs... - Page 2

BLACKzj52 · 02-09-2010, 01:48 PM

you can check it yourself for free. run to autozone and ask them to use a fuel pressure tester in the parking lot. they should let you just use the kit. usually you have to rent it, but if you test it in their parking lot they shouldnt care.

you need 49 PSI +/- 5 I believe

rdupuis · 02-09-2010, 04:31 PM

No Autozone here... maybe Napa? I'll check it out...

CoryMorgan · 02-09-2010, 04:37 PM

If it happens when you turn up your heat let me know! That's happening to mine. I've changed MANY sensors, cleaned every ground possible, new alternator, tune up, dry gas, injector cleaner, anything you can think of...

I'm out of ideas. So I run no heater

Kind of sucks, especially living in upstate ny.

Let me know if you figure anything out.

BLACKzj52 · 02-09-2010, 04:39 PM

napa, advanced, carquest, oriellys, try those or whatever you got near you

fotonm · 06-20-2011, 01:11 PM

After having this same problem on my 94 with a 5.2 I changed EVERYTHING that people have been talking about on here the TPS, New Tranny, New fuel filter, New fuel pressure regulator. Sometimes it would run great then other times just very sluggish and especially between about 1000 to the 2000 rpm mark. It didnt matter if it was hot or cold just very frustrating and intermittent.

Well I started to suspect a vacuum leak. While monkeying with the vacuum lines and wiggling them I got a surge and thought I was on to it. It wasn't the vacuum after all.

It was the wires that go into the TPS and when I would wiggle them it would surge and even cut off the engine. I unplugged it and Ohmed out the wires while my ohm meter was plugged into and wiggled the wires and I didnt get any Resistance drop. I figure out that the pin that comes out from the ground part of the TPS was not making a good contact with the connector. When it was not making a good solid contact I would get the problem.

You can fix this one of two ways.... you can replace the entire plug assembly to one where the female end of the connectors make a better contact or you can take up the slack in the now too loose female end with a small piece of wire inserted into the tooled out female end (lol) and now it wont be like a hotdog in a hallway and will make a good ground. Plugged it all back in and now runs like it should with full power all the way through the spectrum.

This worked for me so you may try this!! Its a connection and grounding problem not an actual prob with any of the devices.

if your grounding and connections in that TPS are not solid it spikes all up and down sending the wrong voltage to the rest of the injection system.

06-20-2011, 01:11 PM	#20
fotonm Registered User Join Date: Jun 2011 Location: Albuqueruqe, NM Posts: 36 Profile Gallery Classifieds My Jeeps	After having this same problem on my 94 with a 5.2 I changed EVERYTHING that people have been talking about on here the TPS, New Tranny, New fuel filter, New fuel pressure regulator. Sometimes it would run great then other times just very sluggish and especially between about 1000 to the 2000 rpm mark. It didnt matter if it was hot or cold just very frustrating and intermittent. Well I started to suspect a vacuum leak. While monkeying with the vacuum lines and wiggling them I got a surge and thought I was on to it. It wasn't the vacuum after all. It was the wires that go into the TPS and when I would wiggle them it would surge and even cut off the engine. I unplugged it and Ohmed out the wires while my ohm meter was plugged into and wiggled the wires and I didnt get any Resistance drop. I figure out that the pin that comes out from the ground part of the TPS was not making a good contact with the connector. When it was not making a good solid contact I would get the problem. You can fix this one of two ways.... you can replace the entire plug assembly to one where the female end of the connectors make a better contact or you can take up the slack in the now too loose female end with a small piece of wire inserted into the tooled out female end (lol) and now it wont be like a hotdog in a hallway and will make a good ground. Plugged it all back in and now runs like it should with full power all the way through the spectrum. This worked for me so you may try this!! Its a connection and grounding problem not an actual prob with any of the devices. if your grounding and connections in that TPS are not solid it spikes all up and down sending the wrong voltage to the rest of the injection system.