Acura

Acura repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

01' Acura CL 3.2 Base model 95k miles. I just replaced the…

Customer Question
01' Acura CL 3.2 Base...
01' Acura CL 3.2 Base model 95k miles. I just replaced the alternator and both valve cover gaskets. After starting, the car will miss on random cylinders. On test drive, CEL flashes. Misfire is felt more so after letting off throttle and at a stop, no miss when A/T is in park. Initially only o2s1 low voltage code appeared. Data showed o2s1 voltage dropping to zero occasionally so I replaced it. O2s1 voltage looked normal now and o2s1 switches normally but random cylinders are still missing with occasional p030X. Had 3 known good coils on hand and swapped 2 on bank #1, 1 on the bank #2. Misfire seems less severe but cylinders with known good coils still show a miss randomly. Removed fuel rails and inspected seals, all look good, some carbon deposits on injectors but nothing out of norm. EGR ports in upper intake slightly dirty but not clogged and plenums have been changed. Spark plugs looked ok and engine grounds look good even though they were never removed. Current fuel trim data shows ltft under +/-5% but stft at -14% about 2/3 of the time but will jump to +14%. 2,500 RPM shows same fuel trims and o2s1 reaction is slow now. Engine ran fine before alternator and vcg were replaced. Currently replacing one injector as I snapped the plastic tip off during removal. Will also replace the other three coils but I don't think that's it. Any ideas? What can cause fuel trim to bounce from too lean to too ***** *****ke that?
Submitted: 2 years ago.Category: Acura
Show More
Show Less
Ask Your Own Acura Question
Answered in 16 hours by:
6/8/2015
Mechanic for Acura: Ron, ASE Certified Technician replied 2 years ago
Ron
Ron, ASE Certified Technician
Category: Acura
Satisfied Customers: 38,105
Experience: 35 years As a ASE Tech
Verified
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The fuel trim readings of -14% indicate a lean engine and in most cases this is caused by an engine vacuum leak. When you replaced the plenum gaskets are you sure you got a good seal. A vacuum leak will also cause a lean engine misfire such as you are having. I would recheck to be sure your not dealing with a vacuum leak.
Ask Your Own Acura Question
Customer reply replied 2 years ago
OK let me start all over, the problem is an intermittent misfire. The original problem was a bad alternator caused by a leaking valve cover gasket. I am an ASE mechanic that is just fixing this car for a friend. After noticing the misfire upon the vcg and alternator replacement, an intake leak was the first thing I suspected so I replaced the 2 upper manifold gaskets that were originally removed and re-torqued them, no difference. At that time the stft at idle was at -10% to -15% about 2/3 of the time, but would jump to +10% to +15% for a while before going negative again, skipping everything in between. At 2,500rpm it would range from -8% to +8% and switch regularly. Ltft has always remained consistent at around +/-5%. At this time the misfire is occurring intermittently when letting off the throttle or at a stop, and is not very evident under load or in park, CEL flashes and TCS light on. Scanner test showed random P030(x) codes along with an o2s1 low voltage code. Data showed random cylinders recorded misfires and o2s1 occasionally dropping to 0V, B+ at idle around 14.3-14.5V. O2s1 was replaced and no longer drops to 0.Since then, I have changed all spark plugs and ignition coils. One coil had a very slight crack above the boot. I also replaced injectors #1 and #3 because the plastic tips were damaged upon removal for inspection of the seals and quality of spray, which both looked good. Injectors had normal amounts of carbon deposits but I put sea foam in the fuel for good measure, tank was about 1/3 full. I also found a slight tear on the air duct. With no MAF, I thought it shouldn't make a difference but I sealed it up with silicone temporarily anyway. The duct is guaranteed 100% sealed. The stft at idle now stays around +3% to +5% and ltft holds steady at around +3 to +4%, both trims staying in the positives. At 2,500 rpm the stft ranges from -5% to +5%, ltft from -3% to +3%.The misfire now occurs intermittently under load and while starting, not when letting off the throttle or coming to a stop as it did originally. Data is showing cylinder #1 registering a miss almost every time under load, even when a miss is barely evident. Cylinders 6 and 4 also record misses intermittently, causing the miss to feel more severe when they occur with the cylinder 1 miss. The other 3 cylinders record misses very, very intermittently. I just came back from another test drive and the CEL finally came on, showing P0301. Data recorded cylinders 1 and 4 missed on that drive.Sorry for the novel but I wanted to be as thorough as possible so there's less back and forth. I'm in Hawaii so there's probably a big time difference. Where should I go from here?
Mechanic for Acura: Ron, ASE Certified Technician replied 2 years ago
I would concentrate on the P0301. With a new spark plug as well as coil I would assume you can rule them out but something is still not right here. I still think if you did not have this problem before changing the valve covers it is likely brought on by doing so. Are you secure the new spark plugs are okay.
Ask Your Own Acura Question
Customer reply replied 2 years ago
The plugs are fine. Cylinder 1 always recorded the most misses even before I replaced the plugs and coils. I even swapped the brand new coils and plugs with cylinder 2 to rule out a part that might've been DOA.I was also convinced I must've screwed up somewhere so after replacing the O2 I retraced my steps and removed the valve covers again to double check if anything was out of norm but everything inside looked good and clean. That's when I discovered the slight crack on one coil and decided to replace them along with the plugs.
Mechanic for Acura: Ron, ASE Certified Technician replied 2 years ago
Well at this point Im out of ideas so if you would like I can reopen the question and see if someone else has a different Idea.
Ask Your Own Acura Question
Customer reply replied 2 years ago
Yeah sure. I know it's a long shot finding an answer on here but I'm stumped. I was thinking of maybe replacing the alternator again at this point as I'm leaning towards an electrical problem because it's intermittent.
Mechanic for Acura: Ron, ASE Certified Technician replied 2 years ago
I'm going to relist it right now. Please do not respond back to me as it locks the question to me and others can not help if they can.
Ask Your Own Acura Question
Was this answer helpful?
Ask Ron Your Own Question
Ron
Ron
Ron, ASE Certified Technician
Category: Acura
Satisfied Customers: 38,105
38,105 Satisfied Customers
Experience: 35 years As a ASE Tech

Ron is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I took the Power Steering O-Ring service bulletin linked from JustAnswer to my Acura dealer, and not only did they no-charge the o-ring, they also replaced the power steering pump at no cost.

Gary RStevenson Ranch, CA

Thank you very much for saving my daughter and her family a lot of money on her Honda. You are definitely on my list for future help. Thanks, again.

FredUSA

I just heard from my mechanic. You were right...a $45.00 job. THANK YOU!! Your response was received in less than 10 minutes!!

Linda B.USA

Your answers were clear and the diagrams were perfect. Dealer wanted $87 for an hour of labor and even I did it in 15 minutes.

EdUSA

HONDA PLATINUM was great. I really appreciate his help. I was ready to trade my new Honda until he told me to wait until I got 3,000 miles on it and my gas mileage would get much better.

SummerUSA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

< Previous | Next >

Meet the Experts:

thebesthonda

thebesthonda

ASE MasterTechnician

783 satisfied customers

26 years experience

Kyle N.

Kyle N.

ASE Certified Tech

631 satisfied customers

Master ASE Tech, Ca. smog lic

HONDASERVICE7791

HONDASERVICE7791

TECHNICIAN

462 satisfied customers

OVER 20 YRS EXPERIENCE, OVER 10 YRS ACURA/HONDA EXPERIENCE

George H.

George H.

ASE Certified Technician

460 satisfied customers

ASE Master Tech 15+ years w/L1 Drivability certification

Andrew

Andrew

ASE Master Tech

350 satisfied customers

Master tech for 11 years.

Chris (aka- Moose)

Chris (aka- Moose)

Acura Technician

210 satisfied customers

16 years of experience

Don - Mo Lurch

Don - Mo Lurch

Acura Mechanic

145 satisfied customers

Aftermarket & Factory Mobile Electronics. Sales, Installation & Repair for 30 years. R/S, etc.

< Previous | Next >

Related Acura Questions
My question is on my 2004 acura mdx windshield washer fluid
my question is on my 2004 acura mdx windshield washer fluid will not spray out in the front or back, put another pump on it and it still do not work checked the fuse is there another fuse or sensor so… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,174 satisfied customers
2009 MDX power windows and door locks have suddenly stopped
2009 MDX power windows and door locks have suddenly stopped working … read more
Anthony P.
Anthony P.
high school
387 satisfied customers
Have a vsa light on with a engine code po 2649. The vsa on
The vsa on in dash with a check engine light on with engine code po 2649 … read more
Anthony P.
Anthony P.
high school
387 satisfied customers
I have a 2006 mdx and the VTM-4 light came on and stayed
Second opinion] good morning i have a 2006 mdx and the VTM-4 light came on and stayed on...i returned home to go get my other car..didnt know if it was safe to drive. … read more
Anthony P.
Anthony P.
high school
387 satisfied customers
Alarm goes off when I open the driver side doors and
alarm goes off when I open the driver side doors and continues for about two minutes. key fob is not working. putting the key in the door and turning left twice then right twice is not working. cannot… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 2006 mdx and the VTM-4 light came on and stayed
good morning i have a 2006 mdx and the VTM-4 light came on and stayed on...i returned home to go get my other car..didnt know if it was safe to drive. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Front ac blower stop working. 2003 mdx. Put a new blower,
front ac blower stop working JA: Have you checked the Freon level? Customer: yes JA: What is the model/year of your Acura? Customer: 2003 mdx JA: Are you fixing your vehicle yourself? What have you tr… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
The alarm goes off and the fob has new battery but won't
The alarm goes off and the fob has new battery but won't disable the alarm and neither will the key what can I do … read more
Anthony P.
Anthony P.
high school
387 satisfied customers
The alarm goes won't disarm with the fob or key and there is
The alarm goes won't disarm with the fob or key and there is a new battery in fob what do I do?… read more
Anthony P.
Anthony P.
high school
387 satisfied customers
I am looking for Front Door Body Seals for a 1995 Acura
I am looking for Front Door Body Seals for a 1995 Acura Integra GS-R 4door. Anu suggestions? … read more
Anthony P.
Anthony P.
high school
387 satisfied customers
When I turn off my rear AC in my 2014 mdx it blows out hot
When I turn off my rear AC in my 2014 mdx it blows out hot air. Why is this? … read more
Anthony P.
Anthony P.
high school
387 satisfied customers
I need my radio code for a 1998 Acura RL
I need my radio code for a 1998 Acura RL JA: Okay, I'll connect you to the mechanic to go over that information regarding your Acura. Before I do, is there anything else you want him to know? Customer… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Car will not start the batt has 12 volts and is new. Car
car will not start the batt has 12 volts and is new. Car will start with a jump box hooked to the same batt … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My 2012 TL just stopped running, the dash lights flash when
Hi my 2012 TL just stopped running, the dash lights flash when we try to start the car and the EPS light has come on the dash. Jumped the car and when we put it in reverse it was very jumpy and did no… read more
Anthony P.
Anthony P.
high school
387 satisfied customers
My 7.5 amp backup fuse driver side panel on Acura TL 2004
My 7.5 amp backup fuse driver side panel on Acura TL 2004 blows as soon as a new fuse is put in. Problem started with a dead battery( fuse not blown). Battery replaced and NAV system needed to be rese… read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
593 satisfied customers
Engine emmision check light is on and loss off power not
Engine emmision check light is on and loss off power not allowing me to accelerate and car is running ruff … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I HAVE AN 1999 ACURA TL 3.2 AND I GET THE D4, LIGHT flashing
I HAVE AN 1999 ACURA TL 3.2 AND I GET THE D4, LIGHT flashing and the trans. does not shift right and i get a code po758 sol.B i change it and its still doing the same thing , can it be something in th… read more
Anthony P.
Anthony P.
high school
387 satisfied customers
I had a bunch of "check" lights all flash on while I was
I had a bunch of "check" lights all flash on while I was driving home … read more
Chris (aka- Moose)
Chris (aka- Moose)
Acura Technician
Vocational, Technical or Trade School
210 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x