davehoose
NAXJA Forum User
- Location
- watertown ny
I have an 89 laredo 4x4 with 4.0 i bought in december of last year. It started having bucking problems shortly after purchase. I tested and replaced the following: o2 sensor (precat), muffler (3 times due to detonation), air charge sensor (autozone), plugs, wires, rotor, air filter, oil change, I recalibrated the crankshaft position sensor and changed the fuel pump and mask.
Here's the problem (or maybe lack thereof). Everytime it started running bad, i.e., the bucking and / or backfiring throught the exhaust, I found one of the above to be bad. I would change a part such as the o2 sensor or air sensor and it would run great for about a week or so and than act up and I would start hitting it with the multi-meter again and find something else reading bad. When I first bought it, I asked the guy I bought it from if the battery was tired because of the slow crank time (like four cranks or so) and he said maybe. The last thing I found messed up, was the crankshaft position sensor connector was corroded. I bought some corrosion cleaner and put that on. It ran okay for a few days and the same thing. Something I need to mention, every time i changed something, I would remove the battery cable and let it set for like a day and then put it back on to "reset" the computer. I finally put that silicone spark plug sealer on over the cps connector. I think i'm in pretty good shape now but it took like a week to start to run well.
It used to crank like five or six times to get going, I am now finding when it is cold it will start right up with hardly any cranking, just like any other vehicle. When it is warmed up, it takes a few cranks or I have this new trick. When I start to crank it, if I let right off the key it may start right up. Not all the time, just somewhere around half the time.
I've checked the compression and the fuel pressure and all is great, especially considering the year (though I must say the speedo only reads 96000 miles). It has been over a week now and the rig started running better and better, no backfire and no bucking, I just keep waiting for it to start messing up again. Anybody have an experience like this with their renix?
Just to go on a little further, I made the mistake of going to the local muffler shop that has cheap oil changes to take care of that. They reccomended 5w30. It now sounds like a sewing machine. I changed it myself with 10w30 but it still sounds clackity, like the lifters are not oiled well. any suggestions?
At any rate, it seems to run fine now other than slow starts when it warms up and the occasional stall when it is cold, if i wait for a minute, it runs fine cold. The air blows ice cold (pretty awesome for a 17 year old vehicle) and the 4x4 works great in the winter, though i have to swing the wheel back and forth to put it in 2wheel (i can live with that, probably need to change the fluid).
I am sold on the renix system because i don't need a computer to troubleshoot, just my meter and a lot of time. I am sure if i went to a stealership i would have pumped a ton of money into my rig.
thanks for any of you having the patience to read this long post as well as any suggestions on keeping my jeep going for the next ten years or so!
[email protected]
Here's the problem (or maybe lack thereof). Everytime it started running bad, i.e., the bucking and / or backfiring throught the exhaust, I found one of the above to be bad. I would change a part such as the o2 sensor or air sensor and it would run great for about a week or so and than act up and I would start hitting it with the multi-meter again and find something else reading bad. When I first bought it, I asked the guy I bought it from if the battery was tired because of the slow crank time (like four cranks or so) and he said maybe. The last thing I found messed up, was the crankshaft position sensor connector was corroded. I bought some corrosion cleaner and put that on. It ran okay for a few days and the same thing. Something I need to mention, every time i changed something, I would remove the battery cable and let it set for like a day and then put it back on to "reset" the computer. I finally put that silicone spark plug sealer on over the cps connector. I think i'm in pretty good shape now but it took like a week to start to run well.
It used to crank like five or six times to get going, I am now finding when it is cold it will start right up with hardly any cranking, just like any other vehicle. When it is warmed up, it takes a few cranks or I have this new trick. When I start to crank it, if I let right off the key it may start right up. Not all the time, just somewhere around half the time.
I've checked the compression and the fuel pressure and all is great, especially considering the year (though I must say the speedo only reads 96000 miles). It has been over a week now and the rig started running better and better, no backfire and no bucking, I just keep waiting for it to start messing up again. Anybody have an experience like this with their renix?
Just to go on a little further, I made the mistake of going to the local muffler shop that has cheap oil changes to take care of that. They reccomended 5w30. It now sounds like a sewing machine. I changed it myself with 10w30 but it still sounds clackity, like the lifters are not oiled well. any suggestions?
At any rate, it seems to run fine now other than slow starts when it warms up and the occasional stall when it is cold, if i wait for a minute, it runs fine cold. The air blows ice cold (pretty awesome for a 17 year old vehicle) and the 4x4 works great in the winter, though i have to swing the wheel back and forth to put it in 2wheel (i can live with that, probably need to change the fluid).
I am sold on the renix system because i don't need a computer to troubleshoot, just my meter and a lot of time. I am sure if i went to a stealership i would have pumped a ton of money into my rig.
thanks for any of you having the patience to read this long post as well as any suggestions on keeping my jeep going for the next ten years or so!
[email protected]