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Unread 02-18-2014, 04:56 AM   #16
Mark05059
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1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
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I would test it just the same. Its a pretty common problem in the cold regions.. don't know so much about florida.

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1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
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Unread 02-18-2014, 06:56 AM   #17
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
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You gave a list of things you have checked. I wish you would have recorded what you got for readings on them. The fact that you have a good 5 minutes before it starts acting up tells you that its an open loop closed loop issue when it starts to read the O2 sensor and use all the sensors for calibrating the air fuel and timing.

First thing on the renix setup is the adjustments. You must set the tps, IAS, and WOT. The adjustments are in the manual. You must set these up. Also, the fact that it immeadiately started to act like the problem with the O2 sensor disconnected makes me suspicious that you are on the problem. Try disconnecting the coolant temp sensor and see what happens.
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Unread 02-18-2014, 12:28 PM   #18
98poswrangler
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I will check both when I get home, thanks guys
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Unread 02-18-2014, 03:22 PM   #19
98poswrangler
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Ok tryin to go through thins, my map sensor, input voltage 5volts, ignition on but not running output voltage is 5 volts, upon firing up jeep output voltage drops to .89 volts, manual sent to me says for a hot engine there should be 1.5-2.1 volt drop with hot idleing engine, obviously mine is dropping 4.2, does this mean a bad map or something else? For some reason my meter is not reading ohms today, for both the mat and cts im showin zero ohms no matter where my meter is set
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Unread 02-18-2014, 03:35 PM   #20
Que89YJ
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You need to set idle first.
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Unread 02-18-2014, 03:36 PM   #21
Que89YJ
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Do the adjustments.
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Unread 02-18-2014, 04:10 PM   #22
98poswrangler
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How would I set idle? Looking through the manual trying to find it. We adjusted the tps when we checked it using the voltages, is there anything else?
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Unread 02-18-2014, 04:29 PM   #23
Que89YJ
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1989 YJ Wrangler 
 
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Idle actuator motor.
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Unread 02-19-2014, 06:21 PM   #24
98poswrangler
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ok to get the proper voltage output at the tps the lever is almost set to wot, at idle position have no voltage at all. bad tps?? when the engine starts surging even if i manually hold the tps to the proper 4.6 volts the surging does not change. also it does not matter which sensor i unplug, the mat, cts, tps, o2, the engine continues to surge, and i am disconnecting the battery in between each test. if i unplug the map electrical connector or the crank position sensor the engines dies straight away. on a side note my temp gauge does not work, dont know if that has anything to do with anything as it has been not working for over a year, bad coolant temp sensor? this issue started with an oil leak on the top of the valve cover. as far as idle, the plunger is set so that when the idle kicks down it is right around 1000, im still trying to find it all in the manual, for ****s and giggles i swapped the relays around and stuck a new map but no difference. im starting to think about parting the damn thing out, this has been an annoying month!! thanks for the help guys
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Unread 02-19-2014, 06:46 PM   #25
Que89YJ
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1989 YJ Wrangler 
 
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Did you check and set the idle motor? It sounds like the tps is bad. Those adjustments tell you what the computer is seeing and if it was that far off then it definitely is bad and having an effect.
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Unread 02-19-2014, 07:56 PM   #26
98poswrangler
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having a hard time finding it in the manuals, i plan on checking that tomorrow, while the engine is surging the plunger is not moving. the tps input voltage is always 5 volts no matter what its doing.
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Unread 02-19-2014, 08:54 PM   #27
Que89YJ
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The TPS voltage should be constant unless the throttle is moved. Then it should be linear.
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Unread 02-20-2014, 06:37 AM   #28
98poswrangler
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K ill update tonight thanks for the help
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Unread 02-20-2014, 06:37 PM   #29
98poswrangler
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Location: edgewater, fl
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no luck today, i think my meter is fried, the idle actuator motor setting may be right, im getting a new meter tomorrow, could it possible for this thing to run if all this crap is bad? it was fine then all of a sudden on a rainy day with a bad oil leak, whammo it starts.
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Unread 02-23-2014, 12:18 PM   #30
98poswrangler
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Ok had to take a few days off, ok idle speed actuator shows 4.95 volts at idle, dont quite know if thats correct, I think its bad, should it not be 4.9 at cold start and closer to zero at warm idle? I followed the way in the manual i believe.The reason I ask is I had to adjust the plunger inward to get that reading and its barely touching the throttle plate, the other way it seems like the plunger isnt strong enough to hold the plate open, either way it still surges. Check the tps with the isa set both ways and I can not get more than 1.7 volts max as t idle and the book calls for 4.6, bad tps also? And the map was bad as it would not hold vacuum and has since been replaced, but alas, did not fix anything.
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bogging , help needed , stalling

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