No Fire, Where Should I Begin? - Page 2 - JeepForum.com

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post #16 of 22 Old 08-17-2011, 06:59 PM Thread Starter
SayBye
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Join Date: May 2011
Location: Chattanooga
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ok good news, sorta...

because i didnt have the 470uf cap i just plugged the ecu back into my jeep and hooked my ignition coil back up. fuel pump came on, it cranked for a few and was wanting to run but wouldnt idle. when i gave it some gas while cranking it, it would run, but not idle with my foot off the pedal. after about 3 minutes, it finally started to idle. i let it run for about 10 minutes.

so where does that leave me? do you think theres still something that needs to be changed out? (either the caps or the ignition coil) or do you think maybe something was just loose and i snugged it back down when i hooked everything back up?

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post #17 of 22 Old 08-18-2011, 05:58 AM
Que89YJ
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1989 YJ Wrangler 
 
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That is a standard ECU. If your CEL came on when you cycled the key then it wasn't the cap issue. I think you were just not getting the key cycle correct. Look at this and retry it:
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post #18 of 22 Old 08-18-2011, 09:45 AM Thread Starter
SayBye
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hahaha wow. thanks for posting that video! i had the key cycle completely off. ill do it right tonight when i get home and let cha know what comes up.
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post #19 of 22 Old 08-18-2011, 05:10 PM Thread Starter
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checked the codes... i got a 12 and a 33.

33 = Air conditioning clutch relay circuit open or shorted ( Also will show up for rigs without AC)

12 = Memory Standby power lost (Batt or computer recently disconnected)

so basically it told me nothing. i dont have my a/c on it anymore and i disconnected the batt and ecu to check the caps on the ecu. so im pretty much lost now, ive done everything i can think up.

now it just doesnt idle by itself. i have to stay on the gas a little. after about a minute, i can let off the gas and it will idle and run just fine.
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post #20 of 22 Old 08-18-2011, 05:16 PM
oldtime_ironman
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Quote:
Originally Posted by SayBye View Post
checked the codes... i got a 12 and a 33.

33 = Air conditioning clutch relay circuit open or shorted ( Also will show up for rigs without AC)

12 = Memory Standby power lost (Batt or computer recently disconnected)

so basically it told me nothing. i dont have my a/c on it anymore and i disconnected the batt and ecu to check the caps on the ecu. so im pretty much lost now, ive done everything i can think up.

now it just doesnt idle by itself. i have to stay on the gas a little. after about a minute, i can let off the gas and it will idle and run just fine.
Well, now you got spark. But since it doesn't idle I'm betting its a fuel issue.
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post #21 of 22 Old 08-18-2011, 07:30 PM
Que89YJ
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1989 YJ Wrangler 
 
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It could be fuel, it could be tune up time. If it's changing cold to warm and you can get a good idle warm chances are one of the sensors are not giving the ecu what it needs. There is a sensor call the IAC that is responsible for idle along with the Throttle position sensor. I would start by cleaning the throttle body, IAC, and TPS and if it's been more than a few years give her a tune up with a new fuel filter, plugs, etc.
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post #22 of 22 Old 08-18-2011, 07:56 PM
oldtime_ironman
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^^^ X2 what Que said. I always tell people to put a good tune up and check for codes first. So that way you know what you have, and a good base line to measure from. The tune makes a *huge* difference on these engines.

By the way, how the heck did you get the gunk off the top of the computer board?
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