94mudrat Posted May 17, 2009 Share Posted May 17, 2009 Hi. Iva 94 V6 manual Pathmaker. it was surging/misfiring so i changed the distributor cap and rotor button and the problem seemed to be fixed but only for a couple of days, now it starts great and run perfect until it reaches normal running temperature and surges and misfires when accelerating under load (up to 2700 rpm) but it still idles perfect and starts perfect there is no engine light on. I would also like to know if the ECU diagnosis would show faults when the engine light is not coming on? any and all help is greatly appreciated cheers Link to comment Share on other sites More sharing options...
MY1PATH Posted May 17, 2009 Share Posted May 17, 2009 Yes it will show some faults (stored codes) did you do new plugs and wires when you did the cap an rotor? are the plugs gaped correctly? Is your timing @ 15 deg? Link to comment Share on other sites More sharing options...
Precise1 Posted May 17, 2009 Share Posted May 17, 2009 Like he said, yes, it may. Check the ECU first, a write up is in the How To section, and go from there... B Link to comment Share on other sites More sharing options...
94mudrat Posted May 19, 2009 Author Share Posted May 19, 2009 thanks guys, i done the plugs yeasterday and my auto shop just got my leads in (120 bones aus) so i'm hoping its it coz i'm running out bones real fast here. I wonder if the catalytic converter will show up on the ecu diagnosis Link to comment Share on other sites More sharing options...
94mudrat Posted May 19, 2009 Author Share Posted May 19, 2009 So far i've done the spark plugs, leads, dizzy, rotor button and fuel filter tomorrow i'll be cheking the ECM Link to comment Share on other sites More sharing options...
94mudrat Posted May 20, 2009 Author Share Posted May 20, 2009 ECU only showed; code 12 = MAF I took it off and it was rather clean so i cleaned it anyway and that hasn't helped its still the same. now i'll try and source a second hand one. Does anyone know if other nissans such as maxima's, navara's or 300zx's use the same MAF ? Link to comment Share on other sites More sharing options...
k9sar Posted May 20, 2009 Share Posted May 20, 2009 (edited) check your connector on top of the MAF. It is a known point of failure. Could be a harness issue. Follow diagnostic proc 24 in the FSM (pg EF & EC 84) Edited May 20, 2009 by k9sar Link to comment Share on other sites More sharing options...
edicer2 Posted May 20, 2009 Share Posted May 20, 2009 defiantly check the wire going to the maf. my freinds pathy the hood would make it act kinda like yours becasue it put a short in the maf connector due to years of it hitting the hood. Where are you located? If in the US and u still want a used one from my old 93 i parted out let me know. SOmeone already has dibs on it but if they dont want it i was thinking about 30 bucks +shipping Link to comment Share on other sites More sharing options...
94mudrat Posted May 21, 2009 Author Share Posted May 21, 2009 defiantly check the wire going to the maf. my freinds pathy the hood would make it act kinda like yours becasue it put a short in the maf connector due to years of it hitting the hood. Where are you located? If in the US and u still want a used one from my old 93 i parted out let me know. SOmeone already has dibs on it but if they dont want it i was thinking about 30 bucks +shipping Thanks mate, I'm from Sydney in Australia, I can locate a 2nd hand maf from a few places but i'm not 100% sure the maf is the problem, If i take the maf plug off it runs even worse. i checked the wires with a muti-meter and theres definitley current running through. This issue only happens when the motor is at running temp and at running temp it idles fine, if i turn it off and wait a few minutes it will start up and drive well for the first minute or so and then it occures again. Thanks for your offer though you're a top bloke cheers. Link to comment Share on other sites More sharing options...
94mudrat Posted May 23, 2009 Author Share Posted May 23, 2009 Yep got a maf off a navara works better but maybe need to give it a clean the code 12 is gone and i'm getting 55 so i'm about to take it for a decent drive and see how she goes. i've only owned the old girl for 4 weeks and haven't seen even one spec of dirt yet. Link to comment Share on other sites More sharing options...
beavis0076 Posted May 23, 2009 Share Posted May 23, 2009 keep the updates commin.. i have a simaler issue on my 91 and am waiting for u to do all the work... Link to comment Share on other sites More sharing options...
94mudrat Posted May 25, 2009 Author Share Posted May 25, 2009 bugga it happened again today i ran the ecu codes and got 55 so i'm not real sure why but after i got going again it was ok, i drove around for 1/2 an hour or so and there was no problems. i'll take it for another rap around block later. the only thing i can think of is i maybe cleared the error when i ran the ecu codes Link to comment Share on other sites More sharing options...
beavis0076 Posted May 25, 2009 Share Posted May 25, 2009 I put a tank of premium in this weekend.. and it seemed to help. ...... the surge went away... not sure it will last.. but it sure lasted enough to get me up here! ... .I'm thinking an injector issue..?? dirty injectors?? Link to comment Share on other sites More sharing options...
wheel366 Posted May 25, 2009 Share Posted May 25, 2009 I still have my issue with misfiring but I think it may be because my pathy was meant to pass emissions in CA and since I added the high flow CAT and headers that the ECU might not be able to provide enough fuel to compensate for more air running through. It could also be a leaky or faulty injector but the misfire is random, not in time. Also, it doesn't do it when I first start the truck. It takes about 20 - 30 seconds before it starts. Now that I am out of warranty I may (that's a big may because I am saving for a house) get new Jim Wolf cams and have the computer upgraded. I would need new lifters too so the price goes up about $400 just for them. Link to comment Share on other sites More sharing options...
94mudrat Posted May 26, 2009 Author Share Posted May 26, 2009 If the headers weren't balanced properly you may have problems with a random misfire perhaps, the hi-flo and headers won't do a real lot for a stock engine eccept make it louder with 3% horse power gain. I think you should get it running properly first before you spend more on performance enhancing. but for sure lumpy cams and a worked head would be nice i think you won't get much change from 4 G bangers($4000) if you do it right. But if you go too lumpy certain 4wd tracks will give you grief but you'll be blowing the doors off any other SUV around town. If your rig is just for off-road mud tracks and full-on hill climbs i recommend 4 cylinders everyday. I had a Z24 Navara before this pathy and the old zed would leave this pathy for dead when comes to off-road Link to comment Share on other sites More sharing options...
94mudrat Posted May 27, 2009 Author Share Posted May 27, 2009 bugga its happened again pathy runs rough when its at correct running temp, no codes other then 55 ive changed everything i can think of. HAS ANYONE GOT ANY SUGGESTIONS AS I'M ALL OUT OF IDEAS The ecu was getting code 12 but another maf has cleared that. Plugs, leads, dizzy cap, rotor button, fuel filter, cleaned maf, sprayed ether around vacuum hoses. what am i forgetting???????????????????????????? Link to comment Share on other sites More sharing options...
beavis0076 Posted May 27, 2009 Share Posted May 27, 2009 Dirty injectors? I ran 2 tanks of premium and had the same issue... I havn't noticed it since last Fri..... Link to comment Share on other sites More sharing options...
94mudrat Posted May 28, 2009 Author Share Posted May 28, 2009 HI ALL my motor doesn't mis a beat now and then, she completly misfires on all cylinders and runs crap when she's reached running temp. although she runs crap at running temp she never stalls. does anyone know if a scan tool exist for a 94 nissan ECM? any sugestions are welcome no mater how @!*%ty it may sound CHEERS Link to comment Share on other sites More sharing options...
fleurys Posted May 28, 2009 Share Posted May 28, 2009 Here's what I think.... O2 sensors big time...It started to do it only when you were up to temp... The o2 sensor will do just that... Technically, the engine will not rely on o2 sensor readings until it is up to temp. So while it waits for it it will make the engine run with a "default" fuel/air mix. Then when the o2 sensor is up to temp, it will vary the the mixture depending on the voltage (between .2 and .8 volts) it receives... I bet you your o2 sensors (before the cat) is / are dead or sending a stupid voltage like 999 volts to your ecu... Then the poor guy tries to adjust the fuel/air mixture with the crap he receives... S. Link to comment Share on other sites More sharing options...
Spenceeros Posted May 28, 2009 Share Posted May 28, 2009 I completely agreed with that guy. It sounds like the o2 sensor. Try unplugging your o2 sensor and drive around for a bit. This will default the computer back to open mode. If you notice a difference, then o2 sensor for sure. Link to comment Share on other sites More sharing options...
94mudrat Posted May 30, 2009 Author Share Posted May 30, 2009 i'll elimimate the 02 sensor next thanks for the input Link to comment Share on other sites More sharing options...
94mudrat Posted July 30, 2009 Author Share Posted July 30, 2009 i'll elimimate the 02 sensor next thanks for the input Sorry I took so long to get back but I finally got the problem fixed Cheers to the fellas who helped It was the o2 sensor bolts in the exhaust between the headers and the cat CHEERS Link to comment Share on other sites More sharing options...
k9sar Posted August 2, 2009 Share Posted August 2, 2009 thanks for taking the time to post the solution to your issue. THis will hopefully be helpful to others in the future. Link to comment Share on other sites More sharing options...
Jeenyus Posted September 1, 2009 Share Posted September 1, 2009 i seem to have that same problem so im gonna try this since ive tried and checked everything else i can think of....but my only confusions is that it runs fine once i get up to a fast speed..and sometimes the problem goes away for a few months and then returns and haunts me for a few weeks and angers me... Link to comment Share on other sites More sharing options...
Precise1 Posted September 1, 2009 Share Posted September 1, 2009 Check the wiring/connections... B Link to comment Share on other sites More sharing options...
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