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Post by labestia on Dec 23, 2009 0:16:08 GMT -5
90 awd justy fuel injected replaced spark plugs/wires, cap, rotor, fuel filter and oil/filter. have also ran a couple of injector cleaner bottles within the last month. idle fluctuates. will be good for a sec. then drops and almost stalls. i replaced the coil as well with one from a 92 carburated model. but was running rough with the previous one also. any ideas what may be causing this?
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Post by Quidam on Dec 23, 2009 0:57:02 GMT -5
Replace/check the injecter seals.?
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Post by RedRooJusty on Dec 23, 2009 2:32:31 GMT -5
90 awd justy fuel injected replaced spark plugs/wires, cap, rotor, fuel filter and oil/filter. have also ran a couple of injector cleaner bottles within the last month. idle fluctuates. will be good for a sec. then drops and almost stalls. i replaced the coil as well with one from a 92 carburated model. but was running rough with the previous one also. any ideas what may be causing this? **labestia** The behavior you describe is most often associated with a malfunctioning O2 sensor. A narrow-band universal O2 sensor is fairly cheap. The other thing I would ask you to check on is the timing. Did you set or check the timing with the ECU in "Service/diagnostics mode"? I don't recall greeting you before, welcome -RRJ
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Danimal
Getting my two Justys back together after a Justy hiatus.
Posts: 589
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Post by Danimal on Dec 23, 2009 13:10:41 GMT -5
Did you set or check the timing with the ECU in "Service/diagnostics mode"? Why would you not want to set the timing with the car operating as it usally does. To what benifit is it to set the timing while in that mode? What changes whilst one is in 'Service/diagnostics mode'? I have seen that you mentioned this more than once and intended to ask already; perhaps you can just link us back to a post that has more details to discourage thread drift. -Danimal
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Post by RedRooJusty on Dec 23, 2009 16:09:52 GMT -5
Did you set or check the timing with the ECU in "Service/diagnostics mode"? Why would you not want to set the timing with the car operating as it usally does. To what benifit is it to set the timing while in that mode? What changes whilst one is in 'Service/diagnostics mode'? I have seen that you mentioned this more than once and intended to ask already; perhaps you can just link us back to a post that has more details to discourage thread drift. -Danimal **Danimal** I think this thread gets an explination. After replacing ignition parts and the O2 sensor on my machine (90' MPEFI). The car accelerated great but wouldn't idle stable. I put the timing light on it a few times, each time showed idle timing was in a different spot. Puzzled by this I then searched the engine bay for the emissions tag, and found it under a layer of dirt. It mentioned setting the idle timing with the green "test mode" ECU connectors connected. After feeling stupid for not reading the tag before, I did what it said to find that my timing was actually set to 13°BTDC. I set it as instructed 5°BTDC +/- 2° and the idle just purrs like a kitten. This most likely the ECU normal operation is closed-loop adjusting the timing, where the test mode turns this function off. I couldn't find another thread that explained this, I mention it to people figuring that they might have missed it as I did (I chuckle recalling looking around the engine bay for the green connectors as the sticker just assumes you know where the connectors are). --update --- adding a picture of the green test mode connectors at the ECU Test Mode (diagnostics) I have learned many great things about the Justy, and am happy to share -RRJ
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Danimal
Getting my two Justys back together after a Justy hiatus.
Posts: 589
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Post by Danimal on Jan 18, 2010 19:19:19 GMT -5
Thanks **RedRooJusty**! I'll let you know how I get on... -Danimal
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Post by labestia on Feb 19, 2010 22:32:47 GMT -5
Thanks all for your help. sorry to reply so late. i did forget to mention i had replaced the O2 sensor. setting timing using that process definitely made a difference. but it still ran weak. i noticed the pcv line from the intake was broken and plugged by the previous owner. decided to fix it using following one of the pcv mods here in the forum. that seems to have made the car run alot better. don't know why. i didn't think it mattered much but i guess i was wrong.
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Deleted
Deleted Member
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Post by Deleted on Aug 31, 2010 1:02:37 GMT -5
Hey RRJ - I messed with my timing last night in an attempt to pass an emissions test, and I didn't do it right. I set the timing using the diagnostic connectors (the green plugs). When viewing the crank pulley with the light in place, I see essentially 4 marks on the pulley in relation to the tab on the timing belt cover. I set it so that the tab was sitting right in the center of the 4 marks, thinking this was "spot on" and the two marks on either side represented the +/- 2 degrees. A friend said I set the timing to 0 degrees BTDC. How do you tell where it's at? I ask because I see that you saw yours was at 13 degrees BTDC and you set it to 5. Where did you get the 13 and the 5?
I am confident that I can set my timing to pass emissions as everything else was clean as a whistle but I missed NOx by 300 ppm (pass = 893, measured was around 1150). However, I would like to know how to set the timing using the method known as the "right way" rather than the way my pops taught me - to do it by feel. Incidentally, as I was charging up the motorway @ 85mph in the 4x4 '91 Justy, it occurred to me that I had not correctly set the timing since I was able to power up the hill like that. I remember - when the car passes - it's absolutely anemic. Good ole' CA gasoline...
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Post by RedRooJusty on Aug 31, 2010 10:55:57 GMT -5
Hey RRJ - I messed with my timing last night in an attempt to pass an emissions test, and I didn't do it right. I set the timing using the diagnostic connectors (the green plugs). When viewing the crank pulley with the light in place, I see essentially 4 marks on the pulley in relation to the tab on the timing belt cover. I set it so that the tab was sitting right in the center of the 4 marks, thinking this was "spot on" and the two marks on either side represented the +/- 2 degrees. A friend said I set the timing to 0 degrees BTDC. How do you tell where it's at? I ask because I see that you saw yours was at 13 degrees BTDC and you set it to 5. Where did you get the 13 and the 5? I am confident that I can set my timing to pass emissions as everything else was clean as a whistle but I missed NOx by 300 ppm (pass = 893, measured was around 1150). However, I would like to know how to set the timing using the method known as the "right way" rather than the way my pops taught me - to do it by feel. Incidentally, as I was charging up the motorway @ 85mph in the 4x4 '91 Justy, it occurred to me that I had not correctly set the timing since I was able to power up the hill like that. I remember - when the car passes - it's absolutely anemic. Good ole' CA gasoline... My timing light has tach and advance, it's really cheating. Anyhow the first mark is 0deg, the next is 5deg, then 10deg respectively as I understand it. The difference for the MPEFI Justy is the ECU can override the idle advance. I agree with you and your pops about fine tuning timing by feel. I say set stock advance to get past smog, then cure the anemic condition the way you know best . -good to hear from you -RRJ
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Deleted
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Post by Deleted on Sept 1, 2010 15:04:09 GMT -5
My timing light has tach and advance, it's really cheating. Anyhow the first mark is 0deg, the next is 5deg, then 10deg respectively as I understand it. The difference for the MPEFI Justy is the ECU can override the idle advance. I agree with you and your pops about fine tuning timing by feel. I say set stock advance to get past smog, then cure the anemic condition the way you know best . -good to hear from you -RRJ Wow - that sounds like a pretty awesome timing light! Thank you so much for the info - so it turns out I was setting my timing to between 5-10 degrees BTDC. Heh. DOH! I finally put away the timing light and set it by feel, and brought up the idle a bit. Hit it with the timing light to check and it was just shy of 0. NOx was literally cut in half. Car is so gutless it barely climbs a hill. I have to hit redline and ease it into 2nd to pull up the hill out of my work! So I stopped at a petrol station, got out my trusty 10mm and put it back. I will check and see where the final timing ended up. So I know (visually) where the distributor needs to be in order to pass. I am going to put a mark on it (just a dot on the dist and head to mark it for myself) so that I can simply spin the distributor to the "smog" mark in order to do the smog test. This is a full dyno smog by the way, the type that my Impreza is excempt from since it's AWD. Pretty funny to see the lil' Justy on the rollers. It was reported to be putting down about 18hp to the wheels during the test on the 25mph test. Woo! Thanks - good to hear from you as well and thank you SO MUCH for the rundown on the timing marks, the picture and the help!! Very appreciated.
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Deleted
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Post by Deleted on May 8, 2011 14:58:28 GMT -5
I'm back in your thread! I used it as a reference again. My car ate it's timing belt in thick San Francisco traffic, and I just got it running again (with the help of my father in law - he did the majority of the r/r while I was at work). If it was even possible, I have even MORE appreciation for the Justy after going through this. It can snap a timing belt and be just fine, and it's a cinch to work on as usual.
Also, in the process I replaced my very worn lower timing belt pulley. This was most likely the source of my *clack-clack-clack* noise. Also, so Armageddous can sleep at night, I replaced my crank pulley bolt (all in jokes, it was quite needed though the threads were visually no different than the new one).
The car runs much better, is much smoother, and my 4krpm power surge is gone. The timing belt was essentially dust - you could flick the teeth off in one section. Odd, I had assumed it was changed since the water pump had obviously been serviced. I got water pump and oil pump kits while I was at it.. Also replaced the sway bar bushings and the car handles better. Good times for the Justy.
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