Light bucking and no power at light throttle, no CELs, poor mpg - Insight Central: Honda Insight Forum
 
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Old 12-11-2018, 04:26 PM   #1 (permalink)
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Default Light bucking and no power at light throttle, no CELs, poor mpg

So, I discovered my OBDII C&C had some fault, I haven't looked into it, I just unplugged it, and have started to focus on the persisting issues.

I have done the following within the past couple months... (with all oem parts)
-replaced primary O2 sensor with NTK 5 wire
-replaced lower engine mount
-replaced driver side trans mount
-replaced spark plugs (all cylinders indexed B)
-replaced engine oil (oil was dark, but not low before)
-replaced transmission fluid (no chunks, but glittery)
-replaced cam tensioner gasket and filter gasket (was leaking)
-cleaned intake chambers, there was corn and nuts under the filter
-checked/adjusted cold valvelash TWICE, its perfectly within oem specs, every exhaust valve is the same, every intake valve is the same
-removed and checked EGR plate, NO buildup, and the holes are clear
-ran one full tank with fuel system cleaner, waited for engine temps to be normal for 15 minutes, then drove aggressively, and shifted at high rpms 45mpg for that tank
-Since that tank, I've been trying to get the most mpg possible, haven't broken 60mpg. I'm at 58mpg at 380miles on this current tank.
-bolted down ecu, it was previously just hanging off harness.
-checked ecu harness pins for corrosion or looseness


I frequently start and drive the car in 20 degree F weather, but it has a coolant warmer thingy, and the car only takes ~2 minutes of driving to reach 160degrees coolant temp, and by 7 minutes of driving its at 197/200 *F

I seem to have to use significant throttle to get ANY acceleration. I'm talking about having the mph go up just by 1, I have to dip the throttle below 50mpg (i stopped using the obd2 gauge, so now I judge throttle position by the mpg gauge) This is a problem, because I can't stay in lean burn and accelerate, something my previous insight could easily do.

When in lean burn, the car also gently bucks, it is not my foot. mpg at the time will be ~70-125, no CEL present. Bucking goes away if I add more throttle, and it kicks out of lean burn, or if I totally lift off the throttle.

I have a fluke multimeter, with clamp meter, if that could be used to help me diagnose a sensor, or something.

Thanks for your suggestions.

Last edited by Number81; 12-11-2018 at 04:39 PM.
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Old 12-11-2018, 04:38 PM   #2 (permalink)
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Have you replaced the O2 sensor?

Scott
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Old 12-11-2018, 04:40 PM   #3 (permalink)
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Have you replaced the O2 sensor?

Scott
Yes, I forgot to put that in first post. Updated, thanks
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Old 12-11-2018, 04:45 PM   #4 (permalink)
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Have you unplugged the EGR valve and taken it for a drive with it disconnected?

Scott
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Old 12-11-2018, 04:52 PM   #5 (permalink)
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Have you unplugged the EGR valve and taken it for a drive with it disconnected?

Scott
Nope, I will do that on my way to work in about 1 hour. Thanks for the suggestion
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Old 12-11-2018, 05:00 PM   #6 (permalink)
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Please try that. Even though you have cleaned the EGR passages the EGR valve could be bad.

At InsightFest this year, Recovering Gasaholic had a bucking problem, I had him go unplug and test drive, bucking went away. He found a new alternative EGR valve from a Honda Odyssey that was reasonable priced. He posted some where here on the forum about the exact year. Advanced Search is your friend.

Please report back your findings after your test drive.

Thanks,
Scott
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Old 12-11-2018, 05:15 PM   #7 (permalink)
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Quote:
Originally Posted by Number81 View Post
So, I discovered my OBDII C&C had some fault, I haven't looked into it, I just unplugged it, and have started to focus on the persisting issues.
Send it back if it needs fixing. you just pay postage both ways.
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Old 12-12-2018, 01:06 AM   #8 (permalink)
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(light bucking update) Well, I drove about 20 miles with the EGR valve disconnected, seemed smoother, I don't think it was bucking. I'm only not 100% sure because I had to drive behind a large truck that I couldn't pass for a few miles, and I think the turbulence was slightly buffeting my car, so it felt kind of like uneven cruising speed.

I did notice that mpg rating was significantly worse while accelerating, like 50% lower. Dipped almost to zero during maybe half throttle. CEL for EGR came on at the very end of the drive, as I expected.


(poor acceleration questions)
Is there something that would make the timing swing around? or give improper engine timing without causing a CEL to show? What else could cause poor acceleration without showing a cel?

I had the exhaust off when I did the bottom engine mount, I tried to get a look at the catalytic converters, but I couldnt see them. I didn't notice any buildup in the pipes, however.
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Old 12-12-2018, 01:42 PM   #9 (permalink)
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So I'm now hunting for a deal on the 2001 Odyssey 3.6 v6 EGR valve (wells part number EGR 4201)

I plugged the egr valve back in, and immediately the car was back to its bucking bronco (not that severe) ways!

I discovered low clutch fluid and its leak inside the car today... priority is having a car that actually drives, so I gotta replace the master cylinder tomorrow afternoon instead of any other projects.

Then I can focus on why the eff the car can't break 60mpg. I might take a look into the "hot intake" mod.
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Old 12-12-2018, 07:32 PM   #10 (permalink)
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I recall it being from a 4 cylinder Accord. https://www.rockauto.com/en/catalog/...egr+valve,4968
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