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Old 12-25-2019, 01:42 AM #1
supawabb supawabb is offline
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rough idle since service

I have a 2017 4runner limited. Has 32000 kilometres (19900 miles). Took it in for its's 3rd oil change and was told upon dropping it off it is up for it's 3rd scheduled maintenance which will include the following:

- Check installation of driver's floor mat.
- Reset Maintenance Reminder Light or system.
- Inspect all lights and horn for proper operation.
- Inspect wiper blades, linkage and washers for proper operation. 1
- Visually inspect drive belts adjust tension if required.
- Replace engine oil & filter (synthetic).
- Lubricate locks, latches and hinges.
- Inspect and adjust level - engine oil, brake fluid, engine coolant, power steering fluid, transmission fluid, differential fluid, and washer fluid.
- Remove & inspect engine air filter. 2
- Remove wheels & visually inspect brake pads, calipers, rotors, brake lines and hoses.
- Remove brake calipers and/or brake drums. Inspect and measure brake rotors, drums, pads and shoes.
- Check and record tire tread depth. Examine tires for damage and uneven wear.
- Rotate tires (applicable to same size wheels, front & rear) or alternatively perform seasonal tire change-over. 3
- Perform 12 Volt battery service and comprehensive electrical charging system evaluation.
- Inspect valve clearance (audibly).
- Check steering gear, linkage and shock absorbers for looseness, damage or leakage.
- Inspect ball joints and dust covers, driveshafts, chassis nuts & bolts for looseness or damage.
- Inspect fuel system for leaks or damage, inspect condition of fuel tank band, fuel tank cap gasket, fuel tank vapour vent system hoses, fuel lines and connections.
- Inspect engine oil cooler lines and automatic transmission cooler lines if equipped for leakage, looseness or damage.
- Inspect exhaust system for leaks, damage or broken hangers.
- Record inspection results, measurements and component condition on inspection form and/or repair order.
- Remove & inspect cabin air filter.


Upon picking it up and starting, the idle is off. Feels like a mild shake throughout the vehicle. Problem is, it is not consistent. Rougher at start than other times. Do not notice it while driving, but at every light, there is a 50/50 it is noticeable. In neutral, I rev the engine a bit and once it revs down, sometimes the rough idle is there and sometimes it is not.

I few days later, this is really bothering me so I start looking at the service paper from the dealer with the full list of everything that was checked on the vehicle and cannot make heads or tails of what may be causing this. I pop the hood, and see both battery terminals have some blue stuff covering them, but do not think anything of it.

Again, a few days later (today), I pop the hood and for some reason, no idea what lead me to it, but I reach over to the positive battery terminal and give them a wiggle, solid. I grab the negative battery terminal and it is very loose, taking 12 or so turns on the ratchet to tighten it properly.

I fire up the vehicle and it seems the rough idle is gone. Take it for a short drive and it seems to run like it did prior to the service. Is this a normal symptom for a loose negative battery terminal, to cause the rough idle?

I will be able to drive the vehicle more tomorrow, and will see if it is really gone.

Thoughts?
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Old 12-25-2019, 02:17 AM #2
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Yes a bad ground can often have negative affects on both fuel and spark, so the rough idle can be a possibility.
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Old 12-25-2019, 10:53 AM #3
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Yes, I'd be 98% sure you just found your problem and fixed it.
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Old 12-25-2019, 07:15 PM #4
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Anytime i see "inspect" in paperwork it means done nothing to me. Next time tell them to change oil and filter and leave everything else heck alone! Do not let them disconnect stuff if they can't connect it properly.
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Old 12-25-2019, 10:52 PM #5
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Precisely why I told those idiots at the dealership not to do anything except change oil.
They always look flabbergasted that I donít want them touching my aftermarket wheels for a rotation or that I donít want a fuel injector service


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Old 12-26-2019, 01:56 PM #6
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Sounds like shop was banking on you returning... Charge you a diagnostic fee and re-tighten battery cables. Find another dealer.
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Old 01-10-2020, 07:14 PM #7
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Issue resolved.

So after I tightened the negative battery cable to the battery post, the vibration seemed to be less, gone at times but present at others. I took the runner back to Toyota, had the service manager come for a ride and again, at times preset and other times not. Like the vehicle was struggling, and then all of a sudden fine. I felt like he was down playing the vibration, trying to tell me it was because it is cold outside (-7 Celcius or 16 Fahrenheit). Not really all that cold at all, especially as the engine temperature was 1/4 between cold and hot, so the engine was warmed up. Then the tech tells me he really doesn't feel anything most of the time. I discuss the issue with him further on the way back to the dealer and he decides to have it booked back in.

The vehicle goes back in a week later, they scan the vehicle, run diagnostics and I get a call. They think it is one of the injectors. Now an injector, coil and something else is on order.

Vehicle went back in today, the injector, coil and whatever else was changed in cylinder #1 and like magic, the vehicle is running smoothly.
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Old 01-10-2020, 07:50 PM #8
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Quote:
Originally Posted by Samer327 View Post
Yes a bad ground can often have negative affects on both fuel and spark, so the rough idle can be a possibility.
Poor ground... Negative effect. I see what you did there.
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