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Car Forum / Jeep / June 2007Fuel system troubleshooting recommendations?
About a month ago I first experienced some problem with the fuel system on my '93 Cherokee(4.0L, 128K). Usually when it happens I am driving down the road and the fuel seems to just cut out for a second or two, but comes right back. On two occasions now it has cut out and wont start for a couple minutes, then all of a sudden it starts getting fuel again and runs fine. I'm thinking, at the very least, I need to replace the fuel filter. I havent yet looked in my repair manual, but did a brief search online. Do I have to pull the whole fuel tank to get to the filter? Anyone got any insight to what this problem might be? TIA Matt Mika Why do you think it's a fuel related problem? Could be, but... What came to my mind was also a faulty CPS. When it gets hot it stops working, then cools down and works again. Could of course also be fuel related, ignition related, computer related etc... regards Odd-Inge Larsen > About a month ago I first experienced some problem with the fuel > system on my '93 Cherokee(4.0L, 128K). [quoted text clipped - 12 lines] > TIA > Matt Mika >Why do you think it's a fuel related problem? Could be, but... I thought it was fuel system related because the 'cut out' is similar to running out of gas. It starts to sputter then gets no power at all. Then suddenly it starts running again. >What came to my mind was also a faulty CPS. When it gets hot it stops >working, then cools down and works again. Could of course also be fuel >related, ignition related, computer related etc... Based on the seemingly high rate of failure of these devices it seems that will be a good place to start. I see that early 90's models may have problems with a low signal strength "due to a larger than desired distance to the flywheel sensing ring." http://autorepair.about.com/cs/faqs/l/bl557h.htm I guess I'll see how well its position and move it closer if possible or replace it and the grommet if it doesnt look like the updated type. Thanks Matt Mika ref: (93 cherokee 4.0) >> Why do you think it's a fuel related problem? Could be, but... > > I thought it was fuel system related because the 'cut out' is similar > to running out of gas. It starts to sputter then gets no power at all. > Then suddenly it starts running again. Second CPS. Fuel filter will show up as a power sag at full throttle (or even light ping) Fuel cutout will give you a bit of hiccup but the engine usually keeps on chugging along. If the fuel pump stops it generally stops, period. >> What came to my mind was also a faulty CPS. When it gets hot it stops >> working, then cools down and works again. Could of course also be [quoted text clipped - 9 lines] > I guess I'll see how well its position and move it closer if possible > or replace it and the grommet if it doesnt look like the updated type. The new ones come with a single hole, the old paper gasket type are no longer produced. I have a writeup on the 93ZJ on my website. http://revbeergoggles.com/cps/ and http://revbeergoggles.com/Fixes/diagnostics.html#CPSdetails  Signature-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors Banks Header - and BEER, in the fridge! Another thing to look at is the fuel pump. Yours maybe getting ready for retirement. Which they will do in the most inconvenient way and place. >> Why do you think it's a fuel related problem? Could be, but... > [quoted text clipped - 18 lines] > Thanks > Matt Mika MattMika proclaimed: >>Why do you think it's a fuel related problem? Could be, but... > [quoted text clipped - 15 lines] > I guess I'll see how well its position and move it closer if possible > or replace it and the grommet if it doesnt look like the updated type. Also check the connections to the CPS. Notorious for getting filthy and corroded. A few disconnects and connects might cure it. ... and check the engine--body ground. > About a month ago I first experienced some problem with the fuel > system on my '93 Cherokee(4.0L, 128K). [quoted text clipped - 9 lines] > > Anyone got any insight to what this problem might be? My `89 Cherokee 4.0L did something that _sounds_ similar. I replaced the fuel filter and it seemed to clear it up -- until it flat-out died on a holiday weekend 6 miles from home in the middle of a neighborhood that looks a lot like Ramadi. The in-tank fuel pump needed replacing and when they did they had to wash a lot of crap out of the tank. Unfortunately, they didn't replace the fuel sender, so I kept running out of gas with about a 1/4 tank left and it had to go back to the shop for that. I don't know that that is what is happening to you, but if it is you might consider replacing the pump and sender while the tank is out. IIRC, there have also been grounding issues with the fuel pump. Someone with better notes on that should pipe up and guide you on that one. Signature"We began to realize, as we plowed on with the destruction of New Jersey, that the extent of our American lunatic fringe had been underestimated." Orson Wells on the reaction to the _War Of The Worlds_ broadcast. Before I posted I was thinking heat might have something to do with it, as the problem started when it started gettingwarm here in Denver. Today its in the upper 90's and when I went for lunch I drove about 10 mins. and it started acting up. Luckily I was able to get out of traffic before it totally died. I let it sit while I ate my lunch and it started right up after a 10-15 min rest. I checked with Autozone online, they have the part for $61.99, havent checked if a location close to me has one in stock yet. I also called Lithia, the jeep dealer by my house, and they said $127.07. Thats quite a difference. Are aftermarket CPS's ok or should I stick with OEM? TIA Matt Mika > Before I posted I was thinking heat might have something to do with > it, as the problem started when it started gettingwarm here in Denver. [quoted text clipped - 10 lines] > > Are aftermarket CPS's ok or should I stick with OEM? I've used both OEM from www.chryslerpartsdirect.com and NAPA (Echlin line). No difference from my experience. But make sure you get the correct part. Considering your talking heat, it could also be the ignition coil. Those can also fail when hot. I had one pull that stunt on me also. Hard to describe the difference, both feel about the same. Although the coil tends to give more grief at high rpm (providing it starts) while the CPS tends to barf when your coming to a stop. Or at least it did for me. SignatureDougW check the coil; while cranking with water and look for arching the coil wires were a big problem too. don't overlook something as simple as a fuse too!!! > > Before I posted I was thinking heat might have something to do with > > it, as the problem started when it started gettingwarm here in Denver. [quoted text clipped - 25 lines] > -- > DougW Thanks to all that replied. I replaced the CPS the day before yesterday and havent had a stall since. Matt Mika > Thanks to all that replied. > > I replaced the CPS the day before yesterday and havent had a stall > since. Thanks for letting us know. That makes one more of a whole bunch of problems traced back to that CPS sensor. SignatureDougW |
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