gillj Posted January 18, 2006 Share Posted January 18, 2006 Let me start by saying that I love the sight both Mrjim.net and NPORA My name is Jason I have a 91 Pathy 4x4 manual V6 And I love this truck its very capable never got stuck yet while I’ve been out playing in it Im not a member of the NPORA as of yet but im going to join soon as I get pics of My truck I do have a few questions for you or anybody out there My truck has an intermitant miss or something I cant figure it out That just started about two weeks ago Sometimes it will start and run fine and smooth for a while than start sputtering And missing or something and sometimes it does it all the time ive replaced fuel and air filters fuel pump new plugs checked resistance on plug wires distributor seems fine im getting strong spark at all wires Ran all my codes and nothing seems to be showing up im open for any suggestions Is it likely that it’s the ECU itself or what Please help Thank you. And I do plan to join NPORA very soon getting very frustrated :furious: Jason.gill@med.va.gov Link to comment Share on other sites More sharing options...
87pathy Posted January 19, 2006 Share Posted January 19, 2006 did you replace the rotor as well? did you check the gap on the new plugs before installing them? if so, possible MAF sensor it sounds like a spark issue to me though Link to comment Share on other sites More sharing options...
94extreme Posted January 19, 2006 Share Posted January 19, 2006 in the dark: lift the hood, start the truck, if you see a lightshow then the wires (or wherever the light comes from) is your problem.. could be crossed or cracked wires... could be the gap or the wrong spark plug, dirty dizzy cap will do it too.. vac line loose.. there could be a million things making it stumble. Link to comment Share on other sites More sharing options...
gillj Posted January 19, 2006 Author Share Posted January 19, 2006 guys i tried everything that you suggested allready but i may have figured it out i hope so anyway I unpluged the o2 sensor and drove it in mode #5 on the ecu last night for awhile and last night and so far all day today its been running good and come to think of it it was acting like it was flooding out god i hope thats what it is anyway strange thing is I wasnt getting a code for O2 sensor so i geuss only time will tell does anyone know When you put it in mode #5 does the ECU not monitor the O2 sensor at that time Link to comment Share on other sites More sharing options...
94extreme Posted January 19, 2006 Share Posted January 19, 2006 it must not be monitoring other thing either.. bad o2 seems to affect the truck differently then you described.. get a new o2 and see if that does help.. your mpgs may drop if you run without the o2 sensor functioning.. Link to comment Share on other sites More sharing options...
gillj Posted January 19, 2006 Author Share Posted January 19, 2006 i figured the mpg would drop but until i get the 150.00 for the new O2 sensor it will have to work at least i wont be sputtering and shaking down the rode any more info on exactly how the ecu works could be helpful Link to comment Share on other sites More sharing options...
94extreme Posted January 19, 2006 Share Posted January 19, 2006 shop around. i got my o2 sensor for under U$40. Link to comment Share on other sites More sharing options...
gillj Posted January 20, 2006 Author Share Posted January 20, 2006 geuss what its still giving me trouble could it be coil or distr it self would that come and go and is there a way to test these if it was the ign control module it would just not run right? any other suggestions Link to comment Share on other sites More sharing options...
Guest hjc Posted January 20, 2006 Share Posted January 20, 2006 Hi when in mode 5 ,at idle you should get no codes, try getting the rps to 2000 while in mode 5 if you get steady blinks its the crank angle sensor. I to have a 91 and it sounds alot like the proublem i just fix.Change the distributor and she runs like new,they are exspensive but i located one on ebay for 30.00 bucks. You can read my posts for my problem under runs rough when up to temp. Link to comment Share on other sites More sharing options...
gillj Posted January 20, 2006 Author Share Posted January 20, 2006 ill try that but mine has the miss when it wants to and at any temp Link to comment Share on other sites More sharing options...
gillj Posted January 20, 2006 Author Share Posted January 20, 2006 when i say it wants to i mean at different times and with no other apparent causes just comes and goes whan it feels like it all speeds all temps no matter what ive done so far even at idle i will try what you suggest HJC is there any way to test the distributor Link to comment Share on other sites More sharing options...
Guest hjc Posted January 21, 2006 Share Posted January 21, 2006 hey, got all my info out of a service manuall for the 91, book is right out of the shop. there is no test for the distributor but the crank angle sensor is in the distibutor. mark the postion of the rotor and pull the distributor. when out leave power hooked up and spin the gears slow. you should hear the injectors opening. my shaft had a small amount of play in it . Like i said in mode 5 at idle you should get no codes,but in the service manuall it said to rev rpms to 2000 this is when i got the code for the crank angle sensor.when i started my post it only happened when she got to temp.but got worse as the day went by.if you want to talk email your # to punkin0823@cox.net Link to comment Share on other sites More sharing options...
gillj Posted January 23, 2006 Author Share Posted January 23, 2006 I think i might have figured it out guys ive narrowed it down to cylinder#2 and its getting strong spark all the way to the plug so its either a sticking valve or injector hopefully its the injector I guess ill find out as soon as i pull the injector out and check it thanks everyone ill lett everyone know soon what it was Link to comment Share on other sites More sharing options...
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