toddler
Gold Member
- Joined
- Jan 26, 2001
- Messages
- 408
- Location
- North Carolina, USA
- Tractor
- Previously: Kubota B2710. Now Deere 3520
Hi everyone,
I seem to have a problem with my '95 Jeep Grand Cherokee that nobody can figure out. I was hoping to get some suggestions from all you mechanically inclined tractor lovers before I bring it in AGAIN.
So here's my dissertation on the problem.
My jeep has the 4 liter 6 cylinder engine, 4wd auto. Because it seemed to have a little less pick up than when new, at 50K miles I decided to do a tune up. So I bought the instruction book for the car, and proceeded to change the plugs, wires, distributor cap, and rotor. Not being a mechanic, I did this all at once, not in steps, and when the book said grease the contacts of the distributor cap with dialectric grease, I greased the ones on the inside of the cap./w3tcompact/icons/blush.gif Apparently the book meant the ones for the wires.
I then restarted my car, with its new Bosch plugs and fancy wires. It fired up after a few seconds, then almost stalled. The tach went to about 300 and the car shuddered, so I gave it some gas. The tach went back to its normal idle, but it seemed rough. I drove it around a little after making sure the wiring was ok, and it drove fine. But the idle stayed rough./w3tcompact/icons/frown.gif
I then went to several mechanics to ask what was wrong, and nobody had any ideas. The wires seemed good, but I changed them again. No difference. Replaced the cap and rotor (sans grease), no fix. Went back to OEM plugs, no fix. Our local jeep dealer and mechanics at 2 garages said it probably was rough before, and I didn't notice.
My jeep has now had a rough idle for 40k more. Every time it goes in for a lube,oil, and filter I ask the mechanic to try to find the problem, and they can't. Fuel injector cleaning/flushing, no fix. Fuel additives, no fix. Complete tune up including fuel filter change, no fix. Several trips to the diagnostic computer, no alarms. Clean the air intake, no change except it runs great for a few seconds while that organic solvent goes through after spraying the butterfly valve.
Well, now it's time to sell. So I bring it to jeep one more time, for a lube oil and filter, and to make sure there aren't any problems with it, and they find nothing wrong. I'm told a lot of jeeps idle rough, maybe I should try running higher octane fuel. So I try that.
BIG MISTAKE!! Now the idle is rougher. Also, while it's OK in park or neutral, when I turn without giving it gas, say backing out of a parking space, it REALLY shudders and feels like it's going to stall. Everything smooths out above idle.
I'm stumped. I want to sell it, but I DON'T want to sell somebody a problem. So what do I do? Any guesses what I did when I tuned it up? Back then I thought maybe I knocked some dirt into the cylinders, but all the mechanics said no, that problem would have resolved itself??? Is it rougher on high octane because it's loosing compression somewhere, or would that get worse at higher rpm's?
If we find the problem, I'll let you guys know. Any ideas where we should start looking?
Todd
I seem to have a problem with my '95 Jeep Grand Cherokee that nobody can figure out. I was hoping to get some suggestions from all you mechanically inclined tractor lovers before I bring it in AGAIN.
So here's my dissertation on the problem.
My jeep has the 4 liter 6 cylinder engine, 4wd auto. Because it seemed to have a little less pick up than when new, at 50K miles I decided to do a tune up. So I bought the instruction book for the car, and proceeded to change the plugs, wires, distributor cap, and rotor. Not being a mechanic, I did this all at once, not in steps, and when the book said grease the contacts of the distributor cap with dialectric grease, I greased the ones on the inside of the cap./w3tcompact/icons/blush.gif Apparently the book meant the ones for the wires.
I then restarted my car, with its new Bosch plugs and fancy wires. It fired up after a few seconds, then almost stalled. The tach went to about 300 and the car shuddered, so I gave it some gas. The tach went back to its normal idle, but it seemed rough. I drove it around a little after making sure the wiring was ok, and it drove fine. But the idle stayed rough./w3tcompact/icons/frown.gif
I then went to several mechanics to ask what was wrong, and nobody had any ideas. The wires seemed good, but I changed them again. No difference. Replaced the cap and rotor (sans grease), no fix. Went back to OEM plugs, no fix. Our local jeep dealer and mechanics at 2 garages said it probably was rough before, and I didn't notice.
My jeep has now had a rough idle for 40k more. Every time it goes in for a lube,oil, and filter I ask the mechanic to try to find the problem, and they can't. Fuel injector cleaning/flushing, no fix. Fuel additives, no fix. Complete tune up including fuel filter change, no fix. Several trips to the diagnostic computer, no alarms. Clean the air intake, no change except it runs great for a few seconds while that organic solvent goes through after spraying the butterfly valve.
Well, now it's time to sell. So I bring it to jeep one more time, for a lube oil and filter, and to make sure there aren't any problems with it, and they find nothing wrong. I'm told a lot of jeeps idle rough, maybe I should try running higher octane fuel. So I try that.
BIG MISTAKE!! Now the idle is rougher. Also, while it's OK in park or neutral, when I turn without giving it gas, say backing out of a parking space, it REALLY shudders and feels like it's going to stall. Everything smooths out above idle.
I'm stumped. I want to sell it, but I DON'T want to sell somebody a problem. So what do I do? Any guesses what I did when I tuned it up? Back then I thought maybe I knocked some dirt into the cylinders, but all the mechanics said no, that problem would have resolved itself??? Is it rougher on high octane because it's loosing compression somewhere, or would that get worse at higher rpm's?
If we find the problem, I'll let you guys know. Any ideas where we should start looking?
Todd
