300,000 miles and counting

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Topic author
candymancan
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Joined: Tue Mar 22, 2016 11:32 pm

300,000 miles and counting

Post by candymancan » Thu Jul 16, 2020 8:55 pm

So my moms 98 4.0 Grand Cherokee laredo just passed 300k miles. She was driving home so she didnt get the 300,000 pic had to be a mile over.. lol

But yea original owner. 300k miles original trans engine everything. All its had done is regular fluid changes on evrrything. Timing chain and radiator.alternator but thats it.


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1998 Jeep Grand Cherokee 5.9L Limited 197k
1998 Jeep Grand Cherokee 4.0 I6 laredo 299k
1990 Jeep Grand Wagoneer 138k

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Stuka
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Re: 300,000 miles and counting

Post by Stuka » Thu Jul 16, 2020 9:38 pm

Nice, that's quite the achievement.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


rocklaurence
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Re: 300,000 miles and counting

Post by rocklaurence » Fri Jul 17, 2020 4:54 am

Wow, and 22 years


Herk
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Joined: Mon Mar 25, 2013 8:14 pm

Re: 300,000 miles and counting

Post by Herk » Fri Jul 17, 2020 10:02 pm

Keep the oil changed, don't overheat it and a 4.0 will run a LONG time. My DD 05 LJ is at 230K and going strong. That said, a new timing chain made a noticeable difference a couple months back.


Topic author
candymancan
Posts: 2445
Joined: Tue Mar 22, 2016 11:32 pm

Re: 300,000 miles and counting

Post by candymancan » Wed Jul 29, 2020 9:59 pm

Yea i did a timing chain on her Jeep at around 220 or so. Her old chain had alot of slack. I decided to do the chain because the harmonic balencer was wobbling. So i did water pump thermostat and chain ect.

Did a tune up on it.. cleaned the throttle body by taking it off and the iac and new plugs and cleaned up the points on the distributor ect. Checked the compression and it had 160 psi in all cylinder but number 3 it had 145.

I suspect 3 number has 145 due to her number 3 valve spring breaking when it had like 70k miles. Yea a valve spring broke at under 100k it was weird. And she drove it for like 30 miles like that too.. probly messed up comoression in that cylinder a little. But 300k and still running lol.


Despite my tune up.. new plugs wires.. cleaned distribitor and cleaned entire throttle body. The Jeep still has to crank like 5-6 times before it starts.. been doing this for awhile.. even when driven. If you park and let it sit for 15 or so min it cranks and cranks before it statts.

I thought maybe it was the check valve in the fuel line causing fuel to drain back.. so i leave it on power for like 15 sec to push fuel back in the line.. but it still does it.

Not sure what to do about it.. but shes getting annoyed by it.
1998 Jeep Grand Cherokee 5.9L Limited 197k
1998 Jeep Grand Cherokee 4.0 I6 laredo 299k
1990 Jeep Grand Wagoneer 138k

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