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Old 10-14-2018, 02:22 PM   #1 (permalink)
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Default Traded Insights, new insight seems like it drives better, but much worse mpg

Had a 2000 insight 5spd, no leaks, new fluids, battery was in poor condition, barely any assist. No under engine panels, hole in hood from accident, one of the front tire panels and deflectors ripped off, but I would easily get 80mpg. If I really tried, I could break 105mpg. I could accelerate slowly, while still showing around 60mpg on the gauge thingy.

Traded for another 2000 insight 5spd, no leaks, similar mileage, but seemingly much better maintained. Has ima c&c, obd2 gauge thing, new bumblebee 180volt, scotts underbody panel, all oem panels are intact and tight, plug in engine heater... Engine drives SOO much quieter than my old one. Only thing we know of that is a negative for mpg is its running mobile eco 0w30. If i never looked down at the mpg gauge, I would think I got a better car.

Except I'm not able to accelerate in the 50-60mpg range (I have to give it so much gas it's showing 25ish mpg just to accelerate slowly) cant maintain or coast accelerate down hills, I constantly have to be giving it some gas, and i've never seen it above 80mpg on the dash gauge.

Car has much better aero, much better battery, so why the 40% disparity in mpg? Does the 10 difference in oil weight make that big of a difference?

I'm thinking there is something wrong with the engine, not being able to give any power until a bunch of throttle is added. Although, it still won't coast in neutral, it slows down so much.

This is all on the same exact tires, roads, direction, same gear, similar temperatures (all within 1 week). I'm very aware of what I'm doing while driving.

Any ideas?

I'm out 2100 dollars, and a much better mpg machine. Help!
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Old 10-14-2018, 04:03 PM   #2 (permalink)
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Welcome to IC.

These are the kind of issues that are probably going to require a test drive by an experienced and qualified member. For that you need to connect with said member. We need your location, it is traditional and useful. Please click "User CP" above, then in the left bar "edit your details" to add a rough location such as city.

There could be several things going on. The engine could have some sort of power issue, as you mention. You could also have a very weak IMA battery which is doing a lot of 4 bar balance charging, or you could have dragging caliphers(check for excess wheel temperatures). Other may suggest other possibilities, but you need to have someone with experience drive it
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Old 10-14-2018, 04:26 PM   #3 (permalink)
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Thank for your response. I updated my location, southwest utah.

I think of your suggestions, I'd rule out bad battery, I can use bat assist liberally (a few minutes at a time) and the %soc goes down less than 10%. It also assists and charges quite rapidly.

Can I check for dragging brakes by simply jacking up the car and spinning the wheel by hand? I know on some cars, I can also check the wheel bearing play in the air.

Does anyone know if the front or rear wheel bearings can be loosened or tightened? I was thinking a bearing might be too tight.

I am willing to drive a few hours one way to meet a member for diagnostics, so anyone in Las Vegas, or Salt Lake City?
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Old 10-14-2018, 05:13 PM   #4 (permalink)
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Quote:
Originally Posted by Number81 View Post

Can I check for dragging brakes by simply jacking up the car and spinning the wheel by hand? I know on some cars, I can also check the wheel bearing play in the air.
Yes, those are good ideas. You can check drag by just spinning a front wheel. Expect a slight drag as all disc brake have a small amount.

Quote:
Does anyone know if the front or rear wheel bearings can be loosened or tightened? I was thinking a bearing might be too tight.
No the bearings aren't adjustable. They are permanently lubricated sealed units. They do sometimes wear out and start making crunchy noises but you'll notice that.

You should obviously check the rears also.

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Old 10-14-2018, 09:04 PM   #5 (permalink)
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Need more info on driving style. Speed and rpm and gear normally used esp. when accel. at 50-60 mph. How many miles on the engine? Maybe a video?
We have a very good (mechanic) Insight member living in Utah, I believe in the southern section, maybe he will respond to assist also.
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Last edited by Willie Williford; 10-14-2018 at 09:07 PM.
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Old 10-15-2018, 12:26 AM   #6 (permalink)
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What tires do you have? What tire pressure do you have? Is the car alignment correct? Does it have the correct spark plugs? Does it have the correct transmission gear oil? Are your brakes dragging? Does it coast good in neutral? Maybe your valves are adjusted too tight these engines are not suposed to run too quiet?
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Old 10-15-2018, 01:29 AM   #7 (permalink)
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Quote:
Originally Posted by Willie Williford View Post
Need more info on driving style. Speed and rpm and gear normally used esp. when accel. at 50-60 mph. How many miles on the engine? Maybe a video?
We have a very good (mechanic) Insight member living in Utah, I believe in the southern section, maybe he will respond to assist also.
Driving style differs wildly dependent on my mood, and distance for the trip. Sometimes I shift at 15, 25, 35, 45, 50 and other times its 20,40, 55, 90, and i never get to 5th becuase of the grade and speed.

My driving style overall is exactly the same on this car, so why does it matter? Not picking a fight, just curious how that helps a diagnosis.

175,000miles on engine.

Quote:
Originally Posted by Sam12345 View Post
What tires do you have? What tire pressure do you have? Is the car alignment correct? Does it have the correct spark plugs? Does it have the correct transmission gear oil? Are your brakes dragging? Does it coast good in neutral? Maybe your valves are adjusted too tight these engines are not suposed to run too quiet?
Previous owner said the valves were recently adjusted, and had an alignment 10k ago. Tires are 50psi insight potenzas. not quite to wear bars.

oem honda spark plugs, matching head casting

oem honda trans fluid

Have yet to check the brakes dragging

No it does not coast well in neutral. Substantially worse than my old insight.

Perhaps, I cant hear the engine at all. Maybe a tiny bit over 40%throttle. My old insight was super rattly and loose sounding, especially around 40-50mpg on the gauge. It would quiet down if adding or subtracting throttle.
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Old 10-15-2018, 08:02 AM   #8 (permalink)
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Maybe your catalytic converter is plugged?
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Old 10-15-2018, 11:52 AM   #9 (permalink)
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Well you need to find out why its not coasting well

I suspect the valves were adjusted too tight recheck the valve clearance
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Old 10-15-2018, 11:55 AM   #10 (permalink)
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As far as the cat you can remove it ad easily see if it is plugged its very easy to remove (assuming its not all rusty)

What city do u live im about to drive from el paso to portland oregon if u are in my path maybe i can drop by
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