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Unread 12-05-2014, 07:23 PM   #1
tricky916
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1989 YJ Wrangler 
 
Join Date: Nov 2011
Location: Sacramento, Ca.
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Fuel Injection Conversion

I have a 1989 Jeep Wrangler 4.2L, with Howell tbi. Would like to convert to a fuel injection system. My question is what Year, Make and Model of Jeeps can I get parts from ?

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Unread 12-05-2014, 07:47 PM   #2
dancytron
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1990 YJ Wrangler 
 
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Howell TBI is a fuel injection system. TBI stands for Throttle Body Injection.

Do you mean convert it to a multi-port fuel injection system? MOPAR makes a conversion kit. http://offroad-review.com/new/index.php?page=95
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Unread 12-05-2014, 09:16 PM   #3
mike134
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1989 YJ Wrangler 
 
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howell TBI is great,

I have the Mopar multiport fuel injection system (MPFI). If there is an advantage over the TBI, It's very difficult to tell... The MPFI costs about $2500 for parts now.

You could also pull off the fuel injection parts from a 94 or 95 wrangler. You'll need a lot of stuff, I think you have to pull the intake, headers, fuel injection electronics, computer, entire wiring harness. you may as well just put the whole 4.0L engine in.
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Unread 12-06-2014, 09:55 AM   #4
tricky916
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Thank You for the correction on the different name types of fuel systems and the responces The question was for the (MPFI). The TBI is a good system, better gas mileage and more power still having issues with it unfortunately.....floods when cold on start up, until warm then it idles smooth. The TBI settings I have are 9 degrees btc, fuel presssure is with in Howells specs, no vacuum leeks, been scratching my head at this point .
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Unread 12-06-2014, 11:06 AM   #5
mike134
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that is interesting. I don't think I've heard of a flooding issue with the howell before. I bet you can get it back into good health. also, I'd do a few diagnostics before going through the expense of MPFI. They may be causing your problems, if so, then MPFI won't help.
Tune-up: Do a basic tune up if you haven't done so in a while, champion copper core plugs, wires, distributor cap, air filter, oil, oil filter
Check for vacuum leaks: Just spray some carb cleaner on all the vacuum lines just after start up. I'd also hit around the intake and exhaust manifold.
Check vacuum pressure: Borrow a vacuum ague from autozone, its free if you leave a depsoit. Use the vacuum gauge to make sure you don't have a leak and your rings and head gaskets are in good condition. Compare to the chart on this page: http://www.jeepforum.com/forum/f12/b...ealth-2841418/
Check compression: you can usually check compression with the vacuum gauge, but a compression gauge is better. It is free to borrow from autozone. Check dry an wet compresion ratio. make sure they are consistant across all cylinders.

If you are serious about upgrading to MPFI, Quadratec has the kit. If you want to try to find the parts yourself in a junkyard from a 94/95 engine, then read the first page of the instructions (parts list) in the pdf on quadratec's site: http://www.quadratec.com/products/17005_01.htm
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Unread 12-06-2014, 05:05 PM   #6
timatoe
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You realize you're not going to be able to pass smog right? Here are your options in CA, Howell TBI kit (that's the way I went and love it), MOPAR MPFI kit, or an entire 4.0 swap and visit to the referee.

You cannot piece meal a kit and pass. You may be able to sneak it past some unknowing tech, but if you get an eagle eye, you've essentially wasted all your time, effort and money.

I'd suggest calling Howell with any issues you're having. BTW, I run an HEI with the Howell and my timing is about 13* BTDC, but I'm also a little higher elevation than you.
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Unread 12-06-2014, 05:12 PM   #7
dancytron
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Your problem isn't that you need a MPFI system or a 4.0 swap.

Your problem is that your jeep is broken, you need to fix it or get it fixed.

The regular tuneup is always a good idea. You can use better Ford parts. http://www.jeepforum.com/forum/f8/i-...nitive-669495/

Otherwise, use the suggestions above, figure out what is broken and fix it. You ought to be able to pull codes from the ECU somehow, which should help you figure it out.
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Unread 12-13-2014, 10:54 AM   #8
tricky916
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1989 YJ Wrangler 
 
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Thanks again for your replies....going to look into the issue of compression, fuel pressure, air leaks, map sensors and what ever else that might be the problem.
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Unread 12-14-2014, 01:48 PM   #9
mike134
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Good choice.

Once you work the bugs out, you'll find the Howell TBI to be an excellent fuel injection system!

AMC didn't plan to use MPFI, that happened when chrysler purchased Jeep and wanted to use their own system instead of the one AMC had designed by Reneau. MPFI turned out to be the wave of the future though.
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