When I put it in neutral down a long hill to just coast and save on gas, sometimes, the temp guage will slowly start to climb up to almost 3/4, then If I put it back in gear the temp gauge will drop back down within 5-10 seconds. Any ideas?

 

not enuff aint freeze or water pump going bad.

 

could be bad thermostat or fan switch is messed up. just flush out your radiator put new coolent/water and get new thermostat with fan switch.


could possibly be water pump.


might as well change your whole timing belt if your going to change the water pump IMO.

 

could it be that there is no coolant in the resoiver? It kinda just disappers sometimes. Don't think its leaking because like i said it kinda just drops a bit one day then maybe stay at that point for weeks and weeks or more then it will drop some more

 

Not enough coolant.

The temp rises because the engine is not spinning the water pump fast enough. Next time rev it up to 3k and hold it there. The temp will most likely go down since the water pump is now moving what little water it can.

If you are losing coolant from the overflow, then you have a leak somewhere or worse, a bad headgasket. Check for leaks first. Check the weap hole on the water pump. When that is "weaping" coolant then that means the seals in the water pump are going out and it's time to replace the pump.

 

makes senese. I'll try and take a look at the hoses later on. But if it was leaking from around the water pump it would leave marks on the ground right? I dont remember seeing anything but I'll take a look again

 

Putting it in neutral during a hill descent wastes gas. Leave the car in gear and take your foot off the throttle, this way no gas (none whatsoever) is going through the engine. The transmission is turning the engine. Also, that way the compression helps you slow down.

 

when i had a bad head gasket my car would do this, and it would also rise while i was at a stop.

 

im having the same problem. One freind says it could be my thermostat, another friend thinks it could be my headgasket. I dont have any leaks, but my coolant is shooting out of my reservoir. Does anyone else have an idea why it would do that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lghnea &raquo;</TD></TR><TR><TD CLASS="quote">im having the same problem. One freind says it could be my thermostat, another friend thinks it could be my headgasket. I dont have any leaks, but my coolant is shooting out of my reservoir. Does anyone else have an idea why it would do that?</TD></TR></TABLE>

having the same problem, my system seems to be pressurized as well, no leaks from the radiator, i'm not leaking or burning any coolent, HG is perfectly fine, could just have air in my system or fault radiator cap, i'm still tryin to figure my trouble out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nors &raquo;</TD></TR><TR><TD CLASS="quote">Putting it in neutral during a hill descent wastes gas. Leave the car in gear and take your foot off the throttle, this way no gas (none whatsoever) is going through the engine. The transmission is turning the engine. Also, that way the compression helps you slow down.</TD></TR></TABLE>

what the hell you taking about. putting the car in neutral when you descending hill won't wast gas. the engine is going in to idle. you can't waste gas going into idle when the car is moving.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsrman171 &raquo;</TD></TR><TR><TD CLASS="quote">

what the hell you taking about. putting the car in neutral when you descending hill won't wast gas. the engine is going in to idle. you can't waste gas going into idle when the car is moving.</TD></TR></TABLE>

How do you think the engine continues to run at idle? Injecting fuel and igniting the air/fuel mixture is how. You are using fuel if the injectors are on.

Anytime the throttle is closed all of the way and above say 1200rpms, then the injectors are off. They do not inject any fuel.

 

maybe it had to do with my old rad cap? i put a new rad in a little while back and new thermostat and all new coolant but still the same old rad cap and it looks kinda old.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IntegraType-R &raquo;</TD></TR><TR><TD CLASS="quote">having the same problem, my system seems to be pressurized as well, no leaks from the radiator, i'm not leaking or burning any coolent, HG is perfectly fine, could just have air in my system or fault radiator cap, i'm still tryin to figure my trouble out.</TD></TR></TABLE>

when i had the problem i wasnt burning coolant i had a leak, on the exhaust cam gear side.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nors &raquo;</TD></TR><TR><TD CLASS="quote">Putting it in neutral during a hill descent wastes gas. Leave the car in gear and take your foot off the throttle, this way no gas (none whatsoever) is going through the engine. The transmission is turning the engine. Also, that way the compression helps you slow down.</TD></TR></TABLE>

So if someone is traveling down a hill, they must leave the car in gear and take their foot off the gas? Who made you King of downhill driving procedure? Ever think that they don't want to loose vehicle speed due to engine braking? That going into nuetral will maintain or increase vehicle speed? Maybe you should try to keep on topic or start another thread for your worthless input. Oh, and the 3 cents saved on gas will be used trying to accelerate back to speed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by F20Cteg &raquo;</TD></TR><TR><TD CLASS="quote">

How do you think the engine continues to run at idle? Injecting fuel and igniting the air/fuel mixture is how. You are using fuel if the injectors are on.

Anytime the throttle is closed all of the way and above say 1200rpms, then the injectors are off. They do not inject any fuel.


</TD></TR></TABLE>

what the hell you get that from?????(i really want to know) next time you at a dyno tell them to put an injector diod(light) on your injectors and i'll bet $100 that your injectors still open and close.




Modified by gsrman171 at 6:30 AM 11/27/2006

 

pressurized system usually means a blown head gasket. Easiest way to tell is open the radiator cap and try to start it. If it starts shooting radiator fluid out of the open radiator it means pressure from within a cylinder is leaking into your coolant system. When this happens your car will usually over heats after it pushes all the coolant into the resevour...or burns it up after pulling it into the cylinder

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nors &raquo;</TD></TR><TR><TD CLASS="quote">Putting it in neutral during a hill descent wastes gas. Leave the car in gear and take your foot off the throttle, this way no gas (none whatsoever) is going through the engine. The transmission is turning the engine. Also, that way the compression helps you slow down.</TD></TR></TABLE>

This is the dumbest thing ive ever heard.

 

Nors: If I pick a point on a hill to throw it in neutral and it picks up speed to 120km/h then i go down the same hill and start at the same point in gear and let off the gas and my max speed is only 70km/h your telling me that my tank full of gas wont last me any longer??

HAHAHAHAH

 

On the fuel-saving note, I learned years ago (through an excellent article on the subject) that the most fuel-efficient way to drive (annoying as it may be for other drivers, and as illegal as it may be), is to MAXIMIZE your speed when going downhill, and use as little fuel as possible when going uphill, meaning to let your momentum take you as far uphill as possible, even if it means you're well below the speed limit before you get to the top.

For the sake of safety, as well as legality, you should maintain a constant speed. Of course, that's not the most fuel-efficient thing to do, but fuel-efficiency was the question, not legality.

I experienced the same coolant temp. behavior in my car when in neutral. Mine turned out to be a combination of a slowly-leaking radiator and the use of an LS water pump instead of a GS-R pump (thanks to the idiots at the fine online parts establishment I ordered the pump from).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sam92Teg &raquo;</TD></TR><TR><TD CLASS="quote">So if someone is traveling down a hill, they must leave the car in gear and take their foot off the gas? Who made you King of downhill driving procedure? Ever think that they don't want to loose vehicle speed due to engine braking? That going into nuetral will maintain or increase vehicle speed? Maybe you should try to keep on topic or start another thread for your worthless input. Oh, and the 3 cents saved on gas will be used trying to accelerate back to speed.</TD></TR></TABLE>

Actually, he is correct, and you use no gas under engine compresion braking in a Honda. Depending on the incline, you might not loose any speed in gear either, which would make it a good way to save a little fuel.

Ignoring that, it is illegal in the US to put the car in neutral while moving. You are required to keep it in gear, automatic or manual transmission.

 

So you're saying when you close the throttle while the car is in gear, it goes 100% lean? Somehow I just don't think that is correct. I'll check my Helm's manual tonight.

 

Okay that is correct, when over 950 RPM and the throttle is closed, current to the fuel injectors is cut by the ECU, the same way that the current is cut when you hit the rev limiter.

As for the OP, I would guess somehow there's not enough coolant circulating when the engine is at idle. What about when the car sits idling, not moving, what happens to the needle?

It shouldn't be anything fan related, as there should be plenty of air flowing through the radiator while the car is moving that the fans wouldn't make any difference.

 

well the temp guage has risen while at stop lights maybe a couple times over the last year thats about it.... rarely happens, and sometimes I can go down the hill in neutral and the temp gauge wont move at all... but i added some coolant in the res the other day and its dropped down a bit again...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsrman171 &raquo;</TD></TR><TR><TD CLASS="quote">

what the hell you get that from?????(i really want to know) next time you at a dyno tell them to put an injector diod(light) on your injectors and i'll bet $100 that your injectors still open and close.
Modified by gsrman171 at 6:30 AM 11/27/2006</TD></TR></TABLE>


Most people that think like you have never tuned a car or looked at a wideband.

Give my $100. You lose. Injectors are completely off when in decel on a honda ecu (if of course the throttle is adjusted within spec).


A simple test for you. Start driving in second gear and rev up to say 6000 rpms. Now let off the throttle completely and stay in gear. Now when you are decelerating, shut the ignition off. You'll notice that the engine does not hicup or anything what-so-ever. So if there was fuel being injected, then the engine would stumble (actually it would be smoother) or be disrupted in some way.