Can not figure this out?
09-24-2018, 06:53 PM
#21
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
09-24-2018, 07:05 PM
#22
Drifting
Thread Starter
09-24-2018, 07:19 PM
#23
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
Ok, you’re GOLDEN then !!...like I said you can find out if any member has a Tech 2 if you want to know if it should read 0...you have a VERY powerful diagnostic tool in your hands...you just have to know how to interpret what your looking at !!...there are some excellent YouTube videos on diagnostics where you can REALLY learn...IF...you have the desire !!...Paul Danner...AKA “Scanner Danner” in my opinion is the best out there hands down...I have been following him for years and if I have a question he always has time to reply !!
09-24-2018, 07:40 PM
#25
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
I’m reading 5 volt ref. KOEO with connector plugged in...that’s “probably” what your scan tool is probably reading...you might be missing your 5 volt ref. if you said it reads 0 !!...the 5 volt ref. is shared between other sensors...another sensor MAY be dragging it down...or you have an "open" in that circuit...if you get to this point and may need help let me know !!
Last edited by C5 Diag; 09-25-2018 at 08:55 AM.
09-24-2018, 08:05 PM
#26
Drifting
Thread Starter
I’m reading 5 volt ref. KOEO with connector plugged in...that’s “probably” what your scan tool is probably reading...you might be missing your 5 volt ref. if you said it reads 0 !!...the 5 volt ref. is shared between other sensors...another sensor MAY be dragging it down !!...if you get to this point and may need help let me know !!
09-24-2018, 08:12 PM
#27
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
09-24-2018, 08:14 PM
#28
Drifting
Thread Starter
ok cool..i will do more testing over the weekend when i can drive it..kinda wish there were codes lol.. still cant understand why power comes and goes based on temp? Thats why i was leaning towards o2 sensors..not get hot enough..
Last edited by 04zjimc; 09-24-2018 at 08:20 PM.
09-24-2018, 08:17 PM
#29
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
09-26-2018, 01:37 PM
#30
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
I know you said you were going to do more testing this weekend...if you want to make the trip to Jersey on Monday ( I'm off) I'd more more than happy to diagnose your ailing car !!...don't know what part of the Island you're from ???
09-30-2018, 12:50 PM
#31
Drifting
Thread Starter
im in suffolk county.. so i did some driving and scanning and did find my o2s switch real slow when im either at a light or in lets say 4th gear..when i was at a light the o2s almost stopped at around 50,60mv then it will switch up and down BUT it kinda jumps hops up and down. The only time it will switch fast is when im driving..i replaced the passenger side o2 maybe last yr and the drivers side 2yrs ago. So not sure if its the sensors are bad lazy or what.can they be cooling down that fast already? I have a short video but its not working to post?
Last edited by 04zjimc; 09-30-2018 at 12:52 PM.
09-30-2018, 01:11 PM
#32
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
Hi !!...usually O2 sensors that are usually starting to get “lazy” are starting to go bad...did you use an aftermarket sensors on the ones currently installed or OEM ??...and when going bad they will indicate lean...what do your long and short term fuel trims look like ??...as far as the hesitation I don’t know if I mentioned it but disconnect your MAF sensor and see what happens when you drive it...it will throw a DTC so don’t worry...also, do you know how to graph your TPS 1 and 2 voltages with the Tech 2 ??...with the key on engine off slowly push the accelerator down and release and look at the TPS signals...they should not have and drop outs or spikes in the signal...you can try this for now !!...good luck !!
09-30-2018, 09:18 PM
#33
Drifting
Thread Starter
Hi !!...usually O2 sensors that are usually starting to get “lazy” are starting to go bad...did you use an aftermarket sensors on the ones currently installed or OEM ??...and when going bad they will indicate lean...what do your long and short term fuel trims look like ??...as far as the hesitation I don’t know if I mentioned it but disconnect your MAF sensor and see what happens when you drive it...it will throw a DTC so don’t worry...also, do you know how to graph your TPS 1 and 2 voltages with the Tech 2 ??...with the key on engine off slowly push the accelerator down and release and look at the TPS signals...they should not have and drop outs or spikes in the signal...you can try this for now !!...good luck !!
Last edited by 04zjimc; 09-30-2018 at 09:20 PM.
09-30-2018, 09:30 PM
#34
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
Another question before you change the O2...have you ever cleaned your MAF sensor ??...I think you said you had a Tech 2...did you look at MAF airflow or frequency at idle and WOT...I prefer looking at frequency...can you try that ??
10-01-2018, 05:55 PM
#35
Drifting
Thread Starter
10-01-2018, 06:59 PM
#36
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,525
Received 2,125 Likes
on
1,690 Posts
Looked at the top snapshot and it looks like the O2 is fixed rich...is the downstream O2 rich ??...normally you would see the short term and long terms fuel trims go negative in this case..,what did the downstream O2 look like ??... Other snapshots O2 looks strange also !!...did you ever look at the TPS voltages with the Tech 2 ??
Last edited by C5 Diag; 10-01-2018 at 08:37 PM.
10-01-2018, 08:39 PM
#37
Drifting
Thread Starter
Looked at the top snapshot and it looks like the O2 is fixed rich...normally you would see the short term and long terms fuel trims go negative in this case..,what did the downstream O2 look like ??... Other snapshots O2 looks strange also !!...did you ever look at the TPS voltages with the Tech 2 ??