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That's the part!

To kidcj82 - Question - Do you have 12 volts on the coil during start? What would cause it? Well I know the ignition switch is in the circuit. I would have to get the book and go from there.

To azipiper151 - The new breather cap should go on top front of valve cover. Question - do you have oil in air cleaner? If so, definitely switch to the combo breather/pcv cap. I did and have no regrets. To kidcj82 - I would check to see if coil is getting 12 volts when ignition is in "start"...

Re: TFI ignition upgrade <edited by TerryMason> To kidcj82 - I would check to see if coil is getting 12 volts when ignition is in "start". This will take two people. Not sure on specifics, but generally, coil should recieve MAX VOLTAGE when ignition is is "start' as compared to when it is in...

To the "won't rev over 3.5k" owner. Wouldn't be surprised if you had a crankcase ventilation problem. Recommend switching the PCV valve to a "Breather cap / PCV valve" It's a breather cap (with wire mesh in cap) plus a pcv valve. Available at Autozone. Fits right on the ol' 258. Mine works...

Part 2... I did this and, as a result, have no oil in the air filter and did it almost concurrrently wit the ignition upgrade so I can't tell you how it affected performace by itself. But I can tell you the vehicle is running OUTSTANDING! Hope this helps. Tom

If it idles OK and is fine up to (or around) 3.5k....then you may have an issue with crankcase ventilation. Let me articulate..... My recommnedation would be to replace the PCV valve with a breather type of PCV valve. It looks like a standard breather cap that has the wire mesh in the housing...

Terry, Performed this upgrade on my 83 CJ7. WOW!!! Cannot believe the performance before and after. Never would have suspected I had an ignition problem. Had a rolling kind of idle at best along with the stalls, lousy acceleration, the hesitation, etc.. Just never wiould have suspected...