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This is mostly random and have not figured out a pattern of when and why it happens really but the car will run like a champ 25% +/- of the time some days i dont even really notice it others its really bad. it seems to lack a little power even on its good days but its at LOW rpm say 1000-3000 range it will buck and spit and sputter and sound like a light back fire BUT it really doesn’t feel like a complete miss and that meaning i pulled the plug wires off 1 by 1 to try and locate the cylinder that was missing i came up with none! (NO CEL for miss either) bad days it will just give one thump every say 30 sec at 45+mph just like its missing a beat lol. When it starts “missing” If i push it into the floor it will perk right back up and put you in your seat. I’ve changed this all in order it was done Fuel Pump and filter, Air Filter, Spark Plugs (Autolite DBL Platinum) and wires, Alternator, PCV, The normal maintenance stuff was done just for that and shortly after the plugs where done this problem arose. With the CEL saying P0420 (cat) so bye bye cats (all 3) ((Yes im getting a new main cat)) NO change but code gone NEW CEL as of today P1151 (PCV) so i went and spent the 5bucks and got a pcv installed no change. Checked motor 3 times now for vacuum leak (Once a month ago, 2 weeks, today while putting PCV in) fixed one and no more to be found. ive check all connections to sensors and plugs to make sure i didn’t knock any off cant find any. Im beginning to get stumped here! Thanks in advance! :woohoo:
Edit: It idles fine 100% of the time and will sit in gear with the brake on with no problems its on above idle and below 3000ish. it also does it alot when going up hills small or big BUT has and will do it on flat and even downgrades. The higher the rpm the less it does it! CEL was blinking (never seen it do it before) coming up my hill last night and it was running bad BUT there is NO misfire code?? Checked CEL it today where i seen the PCV code (only code)!
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P1151 means your running lean. Your front 02 is not switching and staying lean.
With your high idle you could have a vacuum leak. more in this link.https://www.engine-light-help.com/mercury-check-engine-light.html
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Idle is fine normal 600ish rpm. Do you think that the sensor could be bad?? i will try and get a scanner to confirm but judging by what you see could you say it could possibly be bad? and that code came from autozone reader and they said it was pcv code. idk either way it didn’t help lol. Aside from a vacuum leak what could cause this because i have searched that thing high and low for a leak and cant find or hear anything abnormal??
you could have a bad 02 sensor as college man has stated, but i wouldn’t replace parts until you know for sure that is the issue, by checking weather or not that part is bad.
there are really no PCV codes that i am aware of, PCV stands for Positive Crankcase Ventilation and as College man has already stated a P1151 is for a lack of switching on the upstream 02 sensor, this can mean it is bad or you have a lean condition as College man has stated. again check your 02 sensor readings with a scan tool with live data if you can, voltage of a upstream 02 sensor should fluctuate between .300 to .800 volts
would this current diagnosis cause the car to surge pretty bad? i knew it always had surged but today for awhile it was almost enufff the push through my brakes. i had to apply alot more pressure to them then normal. also its only when im off the gas aka idling but most always its only in gear not in park. that and lastly today it was pulling itself around the parking lot at work at like 10mph even up a slight ‘incline it would take it till it just stopped all together and dropped back to idle. also getting scanner today as long as this dude doesn’t flake on me!!
ok so today at autozone i had the codes read one last time before i went and grabbed an 02 (wasnt gonna change till after i hooked it up to a data read and confirmed) Still same code so the zoner is insisting it is a fuel pump (trying to sell me one) so i went ahead and ripped it out and got my warenty pump and a new filter and change just for the heck of it! NO change in how it runs, i then said screw it and cleaned the maf, nothing changed! so after hooking it up to the scanner and watching the 02s B1S1 stayed in the just below 1 and up to about 950 B2S1 did about the same aside from afew random jumps and drops of course i couldnt get it to act up to bad with it hooked up either way i said screw it and changed B2S1 (due to the random drops and jumps) TADA! Still runs like poopy! next buddy is insisting its IMRC so hell he had a reman IMRC just laying around so i through it on PITA btw! still really no change other than when it warmed up this round it seemed to be almost gone! i cant confirm that till tm when i can let it cool down and warm up afew times! Looked for vac leaks agian! still see nor hear anything and wasted some propane even looking around cant find one!! so im gonna say I have ruled out Fuel delivery up to injectors, maf, vacuum leaks, 1 o2, IMRC. Where should i start next?!?! ALSO i was looking at TPS readings today it was 14.9 and i pushed it to the floor got 92 or 94 and let it up for it to read 16.6 this time push it down and let it up to 14.9 and agian to 16.6 and agian and agian where it stayed at 16.6? Whats up with that?
[quote=”ramman1221101″ post=166103]Sorry I’ve been gone for so long but any ideas on what it is??? Or could be???[/quote]
You have a front page of ideas for diagnostic. What have you checked so far?
[quote=”ramman1221101″ post=165561]ok so today at autozone i had the codes read one last time before i went and grabbed an 02 (wasnt gonna change till after i hooked it up to a data read and confirmed) Still same code so the zoner is insisting it is a fuel pump (trying to sell me one) so i went ahead and ripped it out and got my warenty pump and a new filter and change just for the heck of it! NO change in how it runs, i then said screw it and cleaned the maf, nothing changed! so after hooking it up to the scanner and watching the 02s B1S1 stayed in the just below 1 and up to about 950 B2S1 did about the same aside from afew random jumps and drops of course i couldnt get it to act up to bad with it hooked up either way i said screw it and changed B2S1 (due to the random drops and jumps) TADA! Still runs like poopy! next buddy is insisting its IMRC so hell he had a reman IMRC just laying around so i through it on PITA btw! still really no change other than when it warmed up this round it seemed to be almost gone! i cant confirm that till tm when i can let it cool down and warm up afew times! Looked for vac leaks agian! still see nor hear anything and wasted some propane even looking around cant find one!! so im gonna say I have ruled out Fuel delivery up to injectors, maf, vacuum leaks, 1 o2, IMRC. Where should i start next?!?! ALSO i was looking at TPS readings today it was 14.9 and i pushed it to the floor got 92 or 94 and let it up for it to read 16.6 this time push it down and let it up to 14.9 and agian to 16.6 and agian and agian where it stayed at 16.6? Whats up with that?[/quote]
As posted before this and the very first post is what I have done. Today I did codes again an I got p0442 p0420 p0174Your still running lean. p0174 What are your fuel trims doing at idle and 2500 rpm?
I think the next step is a vacuum gauge. I would check for a plugged cat.http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
[quote=”college man” post=166177]Your still running lean. p0174 What are your fuel trims doing at idle and 2500 rpm?
I think the next step is a vacuum gauge. I would check for a plugged cat.http://www.ericthecarguy.com/faq/solving-automotive-performance-issues%5B/quote%5D
I’ll have to check here and I can look for a vaccum gauge and hook it up and it doesn’t have cats at this Present time.ok i was checking intake for leaks and i got 1 time (i could not recreate) where the idle dropped off so i changed *UPPER* intake gaskets just cause very well could of been a crack and it didnt change anything i dont believe its only been 5 miles of driving and it seemed alot more on the end of cruising instead of excel but agian have not really drove enough to say that definitively. Still looking into vacuum gauge and fuel trims (i have to drive it for awhile longer reset the computer) Also if i may add if i get on it like really get on it, if i just pop the throttle back off it will like have a rolling backfire noise till i get it slowed back to normal 55-60 speeds. I also dont know if i mentioned it before BUT it was idling abit rough and i change plugs and wires (RIGHT ABOUT THIS TIME IS WHEN THIS STARTED) on the bright side the idle isnt very rough any more! They where autolite DBL Plats
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