acceleration issue
04-06-2011, 01:29 PM
#1
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acceleration issue this problem has me dumbfounded. 
Problem: Press down on gas pedal and RPMs go up and Engine revs but acceleration just stays the same and eventually will catch up(sometimes). Getting P0173 code for Engine too Lean Bank 2. Not getting misfires or any other codes.
New parts: In-line Fuel Filter, Fuel Pressure regulator(about 1000 miles), spark plugs(about 1000 miles).
Checked: MAF(cleaned with brake cleaner), fuel injectors and optispark wires/hoses. Cleaned air filter. I reprogrammed ECM but didnt help.
Problems: the vented hose that sucks the moisture out of the opti is jerry-riged together until i can find a new one (the blue part in the middle of the hoses is melted....if you know a cheap way to fix im open too). But i dont believe this is the issue.
My knowledge said check MAF sensors and fuel filter but im out of ideas. Its weird sometimes it has no issue and takes off like a rocket but then sometimes (especially hills) it doesnt want to go anymore
Well I hooked up my data log just to see what was going on live. Well its weird Fuel Trim Bank 1 sensor 1 is seems fine but on FT Bank 2 sensor 1 it fluctuates but when Bank 1 goes back down Bank 2 still stays at what it was.
Example, say B1 was at 7.9% and B2 was 8.1%, when i came to a idle B1 would go down to -1.2 or 0.0% but B2 would stay at like 7.8% and not move until i actually started moving again but it would never go down. So its not adding the fuel back to the mixture. Is this a O2 sensor or something else. By the way both O2 Sensor 2 on both banks are simulated with a electronic module.
any insight?
Problem: Press down on gas pedal and RPMs go up and Engine revs but acceleration just stays the same and eventually will catch up(sometimes). Getting P0173 code for Engine too Lean Bank 2. Not getting misfires or any other codes.
New parts: In-line Fuel Filter, Fuel Pressure regulator(about 1000 miles), spark plugs(about 1000 miles).
Checked: MAF(cleaned with brake cleaner), fuel injectors and optispark wires/hoses. Cleaned air filter. I reprogrammed ECM but didnt help.
Problems: the vented hose that sucks the moisture out of the opti is jerry-riged together until i can find a new one (the blue part in the middle of the hoses is melted....if you know a cheap way to fix im open too). But i dont believe this is the issue.
My knowledge said check MAF sensors and fuel filter but im out of ideas. Its weird sometimes it has no issue and takes off like a rocket but then sometimes (especially hills) it doesnt want to go anymore
Well I hooked up my data log just to see what was going on live. Well its weird Fuel Trim Bank 1 sensor 1 is seems fine but on FT Bank 2 sensor 1 it fluctuates but when Bank 1 goes back down Bank 2 still stays at what it was.
Example, say B1 was at 7.9% and B2 was 8.1%, when i came to a idle B1 would go down to -1.2 or 0.0% but B2 would stay at like 7.8% and not move until i actually started moving again but it would never go down. So its not adding the fuel back to the mixture. Is this a O2 sensor or something else. By the way both O2 Sensor 2 on both banks are simulated with a electronic module.
any insight?
04-06-2011, 07:06 PM
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i figured it was but i wasnt going to drop $80 on a hunch that it MAY be the issue. And i know it wouldnt throw a code until it totally stopped working but i wasnt sure if there was something else that would influence the fuel trim like that. I guess ill break down and get a o2 and hope for the best.
04-06-2011, 07:17 PM
#4
i figured it was but i wasnt going to drop $80 on a hunch that it MAY be the issue. And i know it wouldnt throw a code until it totally stopped working but i wasnt sure if there was something else that would influence the fuel trim like that. I guess ill break down and get a o2 and hope for the best.
Amazon has them too.
.
04-06-2011, 09:29 PM
#5
i have a similar problem, it feels like it misses around 2500 rpm or so, seems like it happens more in colder weather. but itll happen at 2000 rpm also all the way throgh 3000.... ive replaced, plugs, fuel filter, wires, i have no rear 02's or emissions stuff and it still does it. this is also on an LS1. Let us know if you figure it out cuz it drives me nuts... i also cleaned my MAF....still nothing and replaced the air charge temperature sensor...
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04-07-2011, 08:04 AM
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and LS6427 thanks for the tip, gonna save me some money
04-07-2011, 09:09 AM
#9
I had this problem due to a dirty MAF. (The dirty MAF triggers the PCM to cut back on fuel.)
Although, if your trim curves are off - that could be a front O2 sensor acting up.
This may cause you problems. You need to clean MAF sensors with special MAF sensor cleaner. The catch is that the sensor cleaner is non-residue, unlike brake cleaner. You can get non-residue contact cleaners, but they are not compatible with the plastic on the MAF. (For that matter, brake cleaner can also dissolve the plastic.) To make sure that you don't have any residue on the sensor, you may want to re-clean it with MAF cleaner.
Although, if your trim curves are off - that could be a front O2 sensor acting up.
This may cause you problems. You need to clean MAF sensors with special MAF sensor cleaner. The catch is that the sensor cleaner is non-residue, unlike brake cleaner. You can get non-residue contact cleaners, but they are not compatible with the plastic on the MAF. (For that matter, brake cleaner can also dissolve the plastic.) To make sure that you don't have any residue on the sensor, you may want to re-clean it with MAF cleaner.
04-07-2011, 03:06 PM
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I had this problem due to a dirty MAF. (The dirty MAF triggers the PCM to cut back on fuel.)
Although, if your trim curves are off - that could be a front O2 sensor acting up.
This may cause you problems. You need to clean MAF sensors with special MAF sensor cleaner. The catch is that the sensor cleaner is non-residue, unlike brake cleaner. You can get non-residue contact cleaners, but they are not compatible with the plastic on the MAF. (For that matter, brake cleaner can also dissolve the plastic.) To make sure that you don't have any residue on the sensor, you may want to re-clean it with MAF cleaner.
Although, if your trim curves are off - that could be a front O2 sensor acting up.
This may cause you problems. You need to clean MAF sensors with special MAF sensor cleaner. The catch is that the sensor cleaner is non-residue, unlike brake cleaner. You can get non-residue contact cleaners, but they are not compatible with the plastic on the MAF. (For that matter, brake cleaner can also dissolve the plastic.) To make sure that you don't have any residue on the sensor, you may want to re-clean it with MAF cleaner.
04-07-2011, 04:20 PM
#11
No problem......get the Denso sensors only...Part # 2344087
All 02 sensors are identical, the length of the wires are the only reason they have different part numbers. The part number above is the longest wire available. Use that sensor in any sensor poistion you need, then zip tie the extra wire to the frame.
They are $38.00 each right now at www.rockauto.com
.
All 02 sensors are identical, the length of the wires are the only reason they have different part numbers. The part number above is the longest wire available. Use that sensor in any sensor poistion you need, then zip tie the extra wire to the frame.
They are $38.00 each right now at www.rockauto.com
.
04-08-2011, 08:34 AM
#12
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ok i feel kinda stupid but since i cant remember which is under my car im going to ask.
Why are some of the sensor connectors flat and others square?
Why are some of the sensor connectors flat and others square?
