Honda/Acura Tech Honda tech discussion.

car bogs at 4k when hot

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Old May 2, 2007 | 01:10 PM
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atreyu06's Avatar
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Angry car bogs at 4k when hot

engine d15b7 mileage around 42k
things replaced so far:
fuel pump & strainer
fuel filter
plugs & wires

it runs fine when its sat for awhile but when it heats up it seems it wants to bog down

no smoke and pcv is clean

could it be the tps? its not throwing a code and did the paperclip in the jumper by the ecu and the check engine light doesnt flash at all it just stays on...

need ideas... was looking to trade the car but then this happened and would rather get it fixed if going to trade it cause i have a conscience hahaha the things ive replaced are after this problem occurred...
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Old May 2, 2007 | 03:34 PM
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get a timing light on it.
that will help you see if it is bogging down because of lack of fuel or something or if it is a timing issue.
also check for a vacuum leak.
hondas do strange things to keep themselves alive.
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Old May 2, 2007 | 03:49 PM
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Originally Posted by norachelhere
hondas do strange things to keep themselves alive.
Lol. So True!

My S bogs around 4,000 - 4,500 rpms when its hot out!
Kinda sucks but then you can just mash the throttle and it will wakes its ass up
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Old May 2, 2007 | 04:11 PM
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thanks for the info i dont know why i never thought of timing... my uncles friend swapped the engine for me and the engine had 27xxx miles on it i think i remember him saying that he didnt mess with the timing since it was a complete engine pulled from a vehicle hit in the back... ill check timing this weekend for sure and as far as vacuum leak, should i by the cheap brand fuel injector cleaner spray and just spray my hoses while the car is running to see if its leaking? i think i read somewhere it could possibly be the fitv? i plan on switching manifolds this weekend and i remember awhile back reading something about either the iacv or the fitv you can flip around the spring or something to bypass either/ or both all together
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Old May 2, 2007 | 08:39 PM
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the timing might not be off, but the ecu might be retarding or advancing to timing too far because there is a sensor that is tweaking out.
As for looking for the leak, i've used starter fluid. and carb cleaner. (not at the same time) the engine will either race up or bog down. if the idle changes at all, then you've got a leak.
I'm not real good with abbreciations so I don't know what an fitv is. however the iacv, idle air control valve, would tweak with the idle. however, if the seal around it has gone bad, that might be your leak. if the valve was bad, then your idle would suck.
does it bog at a certain RPM, or at a certain load/throttle position?
I've worked on a single cam that would bog from 1/4 throttle to Wide open. It didn't matter what RPM it was at.
Hondas are pretty "smart" so if something is wrong and the ecu knows about it, it will retard or advance the timing as much as it takes to keep alive. But if it is something like a clogged injector, the ecu might not notice it, and the timing won't change (much).
also keep in mind when you are checking the timing, that the higher the RPM the more advanced the timing should be. Also, the further open the throttle is, the more advanced the timing gets.
hopefully, it is just a loose vacuum line somewhere. nice and easy to fix. (and cheap)
good luck
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Old May 3, 2007 | 10:46 AM
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thanks the thing is it only happens when the car has been running for awhile... since im a driver on my morning runs its fine but as i get into my runs later in the afternoon then it messes up and bogs it just feels as its getting weaker and weaker as the day goes on and sometimes will feel as if its hitting the rev limiter at 4k, when i changed my plug wires it seems to be able to go longer without any issues, possible dizzy issue?
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Old May 7, 2007 | 12:59 PM
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did you figure it out?

this might sound kinda funny, but when was the last time you got the oil changed? what oil was used? when was the last time you checked the oil level?
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