 Misfire when hot, replaced everything I could think of... |
 Oct 16, 2007 - 4:47 PM
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 Enthusiast  Joined Sep 21, '07 From FL Currently Offline Reputation: 0 (0%)  |
OK, been chasing a misfire for quite some time. The car runs great first thing in the AM but misfires once normal operating temp is reached. Misfires at idle and while driving. First, I have replaced all fuel and ignition components and all vacuum lines. I decarbonized the combustion chamber (MOPAR CC Cleaner, good stuff!). I have replaced the MAP sensor, O2 sensor, and some various wires that looked corroded. Stock 5s-fe.
The engine bay seems to be getting extremley hot! (but not overheating). Yesterday I pulled the plugs to see if they show any evident signs of wear and I was confused by what I saw. The firing end looked great (brown to grayish color), however the insulator on top of the plug was brown and blistered (burnt)?! Anyone ever see this? They are NGK plugs with the factory heat range. Also (not sure if this has to do with the misfire) but every now and then I hear a pop come from my gas tank. Is the "pop" just releasing pressure from the tank? Is it supposed to do that? Sorry so long, I am just truly stumped!! List of parts replaced: Fuel Pump, Filter, Pressure Reg, Charcoal Canister, EGR Valve, and injectors Brand new distributor, wires, plugs, igniter, O2 sensor, MAP sensor, and even the ECU! Could this be a bad cat causing the heat? Cracked head? Thanks for input... This post has been edited by cv7713: Nov 9, 2007 - 11:21 AM |
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Replies
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Nov 9, 2007 - 11:21 AM
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 Enthusiast Joined Feb 18, '06 From NB, Canada Currently Offline Reputation: 12 (100%) |
Are the spark plug gapped to spec? I see nobody mentionned it.
You chagned teh whole distributor, so I assume the rotor and cap are installed correctly. too right? If you want to trouble shoot the o2 sensor, just disconnect it and see if you still have the problem, a car runing rich should not "misfired". One thing I can think of also is the coolant temp sensor, this can really richen up the mixture and actually make it run like crap, I had a 5th gen with a bad coolant sensor and it was randomly going bad. To check this, disconnect it while the engine is warm, the ecu will assume the car is warmed up and adjust the ratio accordingly while ignoring the sensor input. Drive around and check for the symptoms. but it looks like you have a hardcore problem there 
This post has been edited by Rayme: Nov 9, 2007 - 11:29 AM --------------------  -Rémy 02 SiR, 08 250R |
Posts in this topic
cv7713 Misfire when hot, replaced everything I could think of... Oct 16, 2007 - 4:47 PM
cv7713 any suggestions? Oct 16, 2007 - 7:52 PM Blakout16 check your coolant thermister, see if its not open... Oct 16, 2007 - 8:12 PM cv7713 thanks for the reply. no CEL. tried 87, 89, and ... Oct 16, 2007 - 8:41 PM Bitter could be a lean issue, sticking or dirty injectors... Oct 16, 2007 - 10:07 PM 95CelicaST or buy new injectors. Oct 17, 2007 - 12:00 AM x_itchy_b_x you replaced everything that i would suspect to be... Oct 17, 2007 - 7:12 AM cv7713 ok, compression checks ok. 190 +/- on all cylinde... Oct 17, 2007 - 6:28 PM 95CelicaST headers would make the engine bay warmer... unless... Oct 17, 2007 - 7:32 PM supradog1 THANK GOD!!! SOMEONE IS HAVING THE SAM... Oct 21, 2007 - 11:44 AM lagos can you describe "missfire" in more deta... Oct 21, 2007 - 11:51 AM
supradog1 QUOTE(lagos @ Oct 21, 2007 - 12:51 P... Oct 21, 2007 - 1:24 PM cv7713 Misfires at idle, when accelerating, and when driv... Oct 21, 2007 - 1:28 PM supradog1 i puled my distibutor cap off and every thing look... Oct 21, 2007 - 2:04 PM cv7713 dizzy is the distributor. the black thing inside ... Oct 21, 2007 - 2:28 PM supradog1 is the timing off??? if i ajust the timing a littl... Oct 21, 2007 - 2:29 PM cv7713 i've tried adjusting the timing. if you want,... Oct 21, 2007 - 2:35 PM lagos QUOTE(cv7713 @ Oct 21, 2007 - 3:35 P... Oct 21, 2007 - 6:09 PM cv7713 that's what I did, bridged TE1 and E1 and set ... Oct 21, 2007 - 9:21 PM supradog1 i think i know what the problem is!!!... Oct 21, 2007 - 11:14 PM supradog1 ok alt tested out a little low but ok (13 .1 volts... Oct 23, 2007 - 2:26 AM LewFX o2 sensor? did you clean your aic? Oct 23, 2007 - 7:15 AM cv7713 in tank fuel filter is posisble. mine was never c... Oct 23, 2007 - 7:51 AM supradog1 my car has about 200K on it and is a 5s auto... i ... Oct 23, 2007 - 9:03 AM cv7713 mine has 150k but I think the owners before me ran... Oct 23, 2007 - 9:29 AM supradog1 no not at this time i will by fri cause this has g... Oct 23, 2007 - 9:39 PM lagos QUOTEi am starting to think my problem is mechanic... Oct 24, 2007 - 12:05 PM cv7713 ok, here's a couple of vids... tonight it onl... Oct 24, 2007 - 8:26 PM supradog1 my misfire is identical to that!!!... Oct 24, 2007 - 8:36 PM cv7713 QUOTE(supradog1 @ Oct 24, 2007 - 8:3... Oct 24, 2007 - 8:39 PM lagos really hard to tell from that vid, but to me, it s... Oct 24, 2007 - 8:41 PM cv7713 thanks for all your suggestions lagos...
I am put... Oct 24, 2007 - 8:45 PM lagos yeah thats your problem then. it sounds like eith... Oct 24, 2007 - 8:48 PM GriffGirl QUOTE(lagos @ Oct 24, 2007 - 6:48 PM... Oct 25, 2007 - 2:51 PM Bitter QUOTE(GriffGirl @ Oct 25, 2007 - 2:5... Oct 25, 2007 - 9:06 PM cv7713 QUOTE(lagos @ Oct 24, 2007 - 8:48 PM... Oct 24, 2007 - 8:59 PM roelamizzle Sounds like something with your battery connection... Nov 1, 2007 - 11:16 AM cv7713 OK, I think I finally figured it out!!... Nov 6, 2007 - 8:07 AM roelamizzle sweet! Nov 6, 2007 - 8:33 AM supradog1 i havent had time to realy mess with it but i hope... Nov 7, 2007 - 10:55 PM cv7713 The aftermarket seals were $24 for all four b... Nov 8, 2007 - 7:51 AM cv7713 didn't work...
completely out of ideas..... Nov 8, 2007 - 5:28 PM supradog1 QUOTE(cv7713 @ Nov 8, 2007 - 6:28 PM... Nov 9, 2007 - 12:36 AM lagos QUOTE(cv7713 @ Nov 8, 2007 - 5:28 PM... Nov 9, 2007 - 12:58 AM cv7713 QUOTE(supradog1 @ Nov 9, 2007 - 12:3... Nov 9, 2007 - 9:54 AM cv7713 OK, let's think about this... the car misfire... Nov 9, 2007 - 10:39 AM cv7713 Yes on the plugs (.44 if I recall correctly). Th... Nov 9, 2007 - 11:32 AM Enrique This was happing to me the last couple of days....... Nov 9, 2007 - 2:54 PM lagos QUOTEa vacuum test was done and checked ok. I thin... Nov 9, 2007 - 3:12 PM cv7713 OK, no vac leak or exhaust leak. Got the headers ... Nov 15, 2007 - 2:28 PM cv7713 what about a bad ground? it's definately heat... Nov 15, 2007 - 4:18 PM supra12big omg i have the same prob, when my car is not hot i... Nov 15, 2007 - 10:01 PM lagos QUOTEOK, no vac leak or exhaust leak.
how did y... Nov 15, 2007 - 11:09 PM roelamizzle Have you tried getting a shop to run a diagnostic ... Nov 16, 2007 - 3:45 AM GriffGirl I had this problem only when my car was cold; try ... Nov 16, 2007 - 12:21 PM supradog1 i know what the problem is!!! low comp... Dec 3, 2007 - 2:44 PM Guillermo I have a ST202 with 3S-FE engine and I had the sam... Dec 4, 2011 - 10:36 AM RocketScott Have you changed your thermostat and/or water pump... Dec 4, 2011 - 7:06 PM Guillermo QUOTE (RocketScott @ Dec 4, 2011 - 7... Dec 7, 2011 - 5:54 AM stephen_lee old thread, but a weak coil will cause this Dec 4, 2011 - 10:16 PM |
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