EFI issues, Howell Kit - JeepForum.com
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post #1 of 9 Old 10-23-2021, 10:27 AM Thread Starter
mncdriver
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EFI issues, Howell Kit

I have Howell EFI system for the better part of 10 years on my Jeep Yj with the 258 engine. Stock engine, stock distributor, aftermarket OEM style coil. No start condition, jeep has spark, fuel pump working as it should, injectors are not pulsing. Wiring is still hooked up as intended from original instillation. No fuses look to be blown. Check engine light flashes code 12. Wondering what my next step is. Please advise.
thanks
Mark

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post #2 of 9 Old 10-23-2021, 10:41 AM
jbolty
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Originally Posted by mncdriver View Post
I have Howell EFI system for the better part of 10 years on my Jeep Yj with the 258 engine. Stock engine, stock distributor, aftermarket OEM style coil. No start condition, jeep has spark, fuel pump working as it should, injectors are not pulsing. Wiring is still hooked up as intended from original instillation. No fuses look to be blown. Check engine light flashes code 12. Wondering what my next step is. Please advise.
thanks
Mark
I think there is a fuse in the harness up near the firewall. it's closed in a little case and hangs there, Howell I just installed had it and I bet the older ones do too. also, there are the three little fuses under the dash close to the ecm

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post #3 of 9 Old 10-23-2021, 10:47 AM
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I'm not an expert by any means on the Howell system, I'd call them on Monday and ask for Troy. I had some issues with mine and he walked me through the trouble shooting to get it fixed.

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post #4 of 9 Old 11-07-2021, 08:19 AM Thread Starter
mncdriver
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Jeep is now running, issue was a bad Tach Filter.
Results- Reaching out to Howell, i spoke to Troy and he sent me some diagnostic tests to perform. Clift notes to that, pull white wire off negative side of coil. With key on, use a test light and connect it to positive side of battery, tap the white wire listening for the fuel pump and injectors to energize and pulse. If they do, than repeat that with B5 connector at the computer. Fuel pump and injectors energized meaning the tach filter was bad. New Tach Filter from Howell was 50 bucks plus shipping, some good non-insulated connectors and heat shrink and the jeep is back in business for less than 70 bucks.
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post #5 of 9 Old 11-07-2021, 07:59 PM
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Mine was also the tach filter, well mine was actually a bad HEI modules that caused the tach filter to burn up as well as the replacement one.....

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post #6 of 9 Old 11-08-2021, 05:21 PM
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I put mine on few years ago. This is good information to know.
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post #7 of 9 Old 11-09-2021, 07:23 AM
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Mine was also the tach filter, well mine was actually a bad HEI modules that caused the tach filter to burn up as well as the replacement one.....
I don't know if I have a tach filter. Vague recollection of it being optional and the kit I just installed for my friend did not mention it. where? what does it look like? built into harness maybe?

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post #8 of 9 Old 11-10-2021, 12:01 AM
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Quote:
Originally Posted by jbolty View Post
I don't know if I have a tach filter. Vague recollection of it being optional and the kit I just installed for my friend did not mention it. where? what does it look like? built into harness maybe?
It's buried in the harness. There's a tach adapter or some such as well. Seems like the "tach filter" has something to a signal the computer is looking for from the stock distributor (maybe the adjustable timing thing???)

I know that a bad HEI module is what caused mine to go out, then I replaced it and immediately burned up the replacement. Doh!






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Quote:
Originally Posted by George Orwell
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post #9 of 9 Old 11-14-2021, 04:08 PM
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look at that? Hidden in the wires. This is very good information to know. I hope mine don't every go out. That's a ***** to dig out.
Great pics too.
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