Engine & Gearbox Rough idle and low temperature related...?

Discussion in '7th Generation (2003-2008) [Acura TSX]' started by thunder2, Sunday 21st Apr, 2013.

  1. thunder2 Junior Member ☆ ☆ ☆ ☆ ☆

    Had a problem with my 2.4, 2004, manual, saloon, exec accord. Rough idle and the engine would stall at standstill. Also, the management light was on, reporting the cat was not performing to the accepted standard. Replaced the cat and the pre cat lambda sensor (£400) but it's still doing it. Also replaced the spark plugs with NGK iridium ones, put a K&N air filter in and it's still doing the same.

    I've read that the problem may be a vacuum leak and I've noticed the temperature gauge is running slightly low (if 1 is cold and 10 is hot, 5 should be normal but mine's running at about 3).

    Are the temperature gauge reading and the low idle related due to a vacuum leak?

    Any advice would be much appreciated.

    I'm going to try and spray some carb cleaner around the engine (carefully as it's flammable) to see if anything obvious comes up but has anyone come across this problem.

    Engine runs fine when moving, it only runs rough when idling. For a 2.4 engine, I would expect a bit more power but I've never driven another accord to compare mine to. It's a lovely smooth ride but just doesn't have the balls I'd expect from a 2.4 engine. Feels more like a 1.8 at the moment...

    The throttle body and the butterfly valve has also been checked and cleaned.
     
  2. Ichiban Founder Staff Team

    England CJ Leeds
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    Hi Thunder at what engine temperature was this condition be exhibited?. As for rough idling at bone cold engine my 2.4 did that when it has 10 miles on still does it with 80k miles one it. I did the analysis of this situation and found Honda fuel trim on cold engine is really rich so the engine runs unevenly there is nothing you can do to change it nor is it a problem. Some 2.4 don't show this issue some do as does the fact some whine when they are cold and some don't whine when cold.

    What was the code for this MIL? was it the heater element ? There is a known issue on prefacelift cars .Engine & Gearbox - Honda Accord oxygen sensor LAF sensor malfunction resulting in MIL on dash You need to check if your car is in the affected VIN range? did you take it to a honda dealer to get this addressed? backstreet garages won't have a clue at ALL. What iridium plugs were used type and model, a K&N filter will make no difference to this issue at all try getting the car running right on stock parts. are all the hoses correctly clamped on the throttle body rubber elbow check the PCV valve on the block for blockage.

    I seriously doubt it will be a vacuum issue it will be a lose hose!! to get a better reflection of engine temperatures you need to hook up the HDS system and do a real time data capture from a cold engine to see the values it highlights incorrect values in red


    You will need the dealer to do a idle learn procedure on the car (dead link removed by staff)

    if you get stuck just ask.:Wink:
     
    Last edited by a moderator: Sunday 15th Feb, 2015
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  3. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    On a cold morning and on fast idle my 2.4 smells really really rich but I've not found an solution to this either. As CJ says that's just how they are.

    Idles always been smooth on both my 2.4s. Listen to the exhaust note carefully, does it sound like it's missing ? If so have a look at the coil packs.

    Temperature gauge sat below half way mark sounds fine, mine does that too.

    You need to get the revs up for it to move quick.
     
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  4. tonygw Valued Contributor ★ ★ ★ ☆ ☆

    sorry to hear of your woes.
    I would agree with above, possibly coil packs.
    I had a similar thing on our Audi. I used a generic code reader to get the fault code which in the case of the audi told me it had a misfire on cylinder 4. replaced the coil pack and all was well. Not sure on these honda's.. I'm still learning my self. But if it has OBD2 then a generic code reader should give you a clue. It won't tell you exactly whats wrong but will point you in the right direction. or as mentioned a Honda dealer can pull the exact fault codes and tell you what is wrong. Thats what I would do.
    You could also do a good check for anything underthe bonnet such as lose cables poor connections dirt on coil pack conections. Could be a lose connectionont he coil pack to spark plug whihc rights itself when warm.

    May be a problem with a cold idle sensor or something.. I am guesing now but if it rights itself once warm then its another avenue to check.

    good luck
    Tony
     
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  5. thunder2 Junior Member ☆ ☆ ☆ ☆ ☆

    Wow! You guys know your stuff! :Aghast:)

    I'm due to take it back into the garage soon because even though the cat's been replaced, it's still dying on me in traffic and at lights when standstill.

    A daft question but, the car's covered under a Dealer Warranty Direct policy. I think I should have taken it into the dealers at the beginning to see if they can source the problem. Just hope it's not a part that isn't covered by the insurance as genuine parts from the Dealer can be right pricey!

    I'll update y'all when I've done that. And I'll ask the mechanic what the problem was (if it gets sorted!) and update this too.

    Thanks for the advice so far. More info soon...
     
  6. Ichiban Founder Staff Team

    England CJ Leeds
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    You changed the cat too OMG buddy I am sorry you have been taken to the cleaners by a technician who has no clue ...it is a simple idle learn first .. Coil packs and cats are robust as concrete they just don't fail.

    as for warranty direct you need to raises claim with them first before changing parts on your car I think...
     
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  7. thunder2 Junior Member ☆ ☆ ☆ ☆ ☆

    The engine management light kept coming on and it kept reporting the cat was at fault and ever since it's been replaced, the engine management light hasn't come on, but the car's still stalling.

    I'll take her into the dealers or the local Honda specialists on Wednesday and see what happens from there.

    - - - Updated - - -

    Also, I've still got the old cat so will get it checked out. It looks tip top but may still be at fault...
     
  8. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    Do you know what the OBD code were comnig up when the engine light was on. As mentioned already the cats rarely go, normally it's an issue with the o2 sensors. So it would be interesting if you find out what the codes were.
     
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  9. Richardp2020 Junior Member ☆ ☆ ☆ ☆ ☆

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    I have a slightly rough idle (650 RPM) as well, I'm going to try running some additive and do the idle learn procedure to hopefully sort it.
     
  10. Ichiban Founder Staff Team

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    Thunder any updates , Richard if you got minor hunting it will be resolved by a idle learn.
     
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  11. Richardp2020 Junior Member ☆ ☆ ☆ ☆ ☆

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    I'm going to give it a go and report back on how it goes, honestly speaking it isn't that bad, but I'm OCD about my cars :Smile: just a coolant, transmission oil, brake and clutch fluid change, front brake bad change, idle learn, valve clearance, fuel filter change, handbrake adjustment and detailing to go before I'm happy :Wink:
     
    Ichiban likes this.
  12. Ichiban Founder Staff Team

    England CJ Leeds
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    Please do keep us posted and if in doubt help isn't far..:Wink:
     
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