MPI ordered today - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-24-2003, 04:36 PM
bmwfirearms
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MPI ordered today





Well i just ordered the MPI today, I hope i can kiss my vacuum leaks GOODBYE!

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post #2 of (permalink) Old 06-24-2003, 04:48 PM
 
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Re: MPI ordered today

Did you order the Mopar MPI kit? If so, you will be amazed how much stuff you remove and toss. It really cleans up the engine compartment.
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post #3 of (permalink) Old 06-24-2003, 04:56 PM
bmwfirearms
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Re: MPI ordered today

yes, the mopar MPI kit.

I dont think for an investment purpose it was good idea, I willnow have about $9000 in this CJ,

But, I am still excited about getting it to run goood and cleaning up under the hood
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post #4 of (permalink) Old 06-24-2003, 05:33 PM
 
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Re: MPI ordered today

To be honest, I would still do the MPI again. I get better mileage now and she just runs so much better. The one downside is that I have to use a minimum 89 octane gas. Be careful when you remove that hamonica balancer, I ended up crushing my pinky between it and the radiator. Live and learn. Good luck!
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post #5 of (permalink) Old 06-24-2003, 06:24 PM
 
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Re: MPI ordered today

Make sure you do the 4.0 HO head conversion at the same time to help reduce some or all of the knocking and pinging. I wish I had done it already. [img]images/graemlins/crazy.gif[/img]
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post #6 of (permalink) Old 06-24-2003, 07:05 PM
 
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Re: MPI ordered today

Will that head change really eliminate the knocking and pinging? Were I to do that change, could I then use 87 octane gas?
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post #7 of (permalink) Old 06-24-2003, 08:15 PM
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Re: MPI ordered today

I didnt get the 4.0 head, because of the head bolts, I think i would have to enlarge (drill tap) to use 1/2" bolts right?
post #8 of (permalink) Old 06-25-2003, 12:15 AM
 
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Re: MPI ordered today

From everything I've read about the conversion, the 4.0 head adds an additional amount of horsepower, 25-40hp, and I believe cures the pinging problem. I haven't heard of someone having the pinging once they've put the 4.0 head on. According to Tim Weaver's write up the '81 to '87 year 258's do need to be tapped for 1/2" bolts to replace the 7/16" bolts. But I surely don't want to give out any bad information, this is what I have gathered and believe to be true through my research about my own pinging. My next step is to put the 4.0 head on. Maybe someone on the board can give a definative answer and let us know if they have the 4.0HO head and still have the pinging problem, and if they can run lower octane gas.
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post #9 of (permalink) Old 06-25-2003, 12:50 AM
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Re: MPI ordered today

You can use the 7/16 bolts by using alignment spacers to bolt the head down. HESCO and I think Summit or Jegs have the spacers available. Drilling and tapping for 1/2 in bolts is still the preffered method though. I was lucky, my '80 block used 1/2 in. I think you should seriously consider the 4.0 head while you're at it.
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post #10 of (permalink) Old 06-25-2003, 09:20 AM
85Jeepny
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Re: MPI ordered today

I think the 4.0L head is the way to go. There is quite a bit of info on the swap just on this board alone. Search for it on Google as well, a lot of good info.
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