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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21990
Experience:  BEng hons Mech engineering, in auto industry 22 years
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2007 honda deauville nt 700 with abs, when warm/hot develops

Resolved Question:

2007 honda deauville nt 700 with abs, when warm/hot develops flat spot and sometimes stalls engine this model has HISS.
Submitted: 3 years ago.
Category: Car
Expert:  Shantal-Mod replied 3 years ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
We have been working with the Experts to try to help you with your question. Sometimes it may take a bit of time to find the right fit.
I was checking to see if you had already found your answer or if you still need assistance from one of the Experts.
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Thank you,
Shantal
Customer: replied 3 years ago.

yes Shantal im still waiting with baited breathe kind regard scott.

Expert:  Shantal-Mod replied 3 years ago.
Hello Scott,
Thank you for getting back to me. We will continue to look for a Professional to assist you.
However, should you wish to close your question and reverse your charges at any time please let me know.
Thank you for your patience,
Shantal
Expert:  Matt replied 3 years ago.
Hello

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.
As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.
Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.
Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.
if the engine condition is the same then chances are the meter or the connection to it is faulty

Air leaks are very temperature dependent as gaps can open or close up as things expand with heat, so the weather and engine temperature can effect them.

This leads them to be quite intermittent in the case of mild leaks

its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue

On no account touch the sensor wires with anything physical as they are extremely fragile
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21990
Experience: BEng hons Mech engineering, in auto industry 22 years
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Customer: replied 3 years ago.

yep hi mat thanks for your indepth solution to what was a mind boggling teaser for the honda deauville. per haps slightly to in depth but very informative never the less. this may be one for your book. the 700 nt deauville has a very poor fitting air box wich sits orquadly on inlet manifolds and squashess vacume pipes wich confuses air preasure sensor. we found running the engine without air filter and correctly fitted air box sust the problem. so installing new air filter and correctly fitting air box sorted problem. many thanks scott, ( scotmotorcycles ).