Tagged: 3.5L backfire MDX 2006
August 14, 2020 at 12:12 pm #962999
Hello every one have been haveing quite a time with my 2006 3.5L mdx would.resetting the ecm solve to.backfire no.start … ie it died at full.throttle.trying to.move off road
August 14, 2020 at 6:46 pm #963018
Sounds like a timing issueAugust 14, 2020 at 9:46 pm #963022
Had my mechanic look in to it and marks all line up … as that is what I initially thought tooAugust 14, 2020 at 9:49 pm #963023
Some one plz just want her back b4 the white hits the groundAugust 15, 2020 at 1:00 am #963028
Just because the mechanical timing marks align does not mean the ignition timing is correct.August 22, 2020 at 10:57 am #963223
How so please explainAugust 22, 2020 at 2:58 pm #963239
I’m taking a shot in the dark here, thinking you have limited knowledge on the matter.
Also, asking for an explanation when a simple google search will provide you with the information gives the impression your not very interested in the solution.
In any case…
There are two kinds of timing that take a seat at every engine event. The first is called cam timing, the second is ignition timing. Cam timing has more to do with all of the heavy stuff moving fast inside your engine. Remember the valves and pistons? Both of these are moving, and the piston is moving with the explosive oomph provided by the other cylinders in your engine. Your engine has a timing belt or chain that does a lot more than take energy from the spinning crankshaft and use it to spin the camshaft or camshafts. Its job is to make sure the valves are out of the way when that piston comes flying toward the engine’s head. In some engines, the piston can actually impact a valve at the top of its movement. In these engines, called “interference” type engines, even a slight slip in cam timing can be catastrophic and result in a complete engine overhaul — thousand of dollars. This is one reason it’s so important to inspect your timing belt for wear or damage.
Luckily unless you’ve been doing some serious work on your car, the cam timing is probably right on the money. If it wasn’t, you’d know it because your car would be running horribly, if at all. Your ignition timing, on the other hand, can be throw off by any number of little things. The good news is it’s just as easy to adjust and reset. A little history: The engine in your car or truck has 4 cycles. Each one of these cycles is repeated in each cylinder. First, it sucks in air and fuel. Most new cars use direct injection so the air gets sucked in through the intake valve while the fuel is blasted in by a precise injector. The second part, or stroke, in each cylinder is called the “compression stroke.” Now the air-fuel mixture is literally compressed tightly. This creates heat and volatility in the mixture. The third stroke is the ignition or combustion stroke (now we’re getting somewhere). At this point the spark plug fires and ignites the air-fuel mixture, causing the piston to be pushed back down to the bottom of the stroke.
The final stroke is the exhaust stroke. At this time the exhaust valve opens up and lets the old, burnt mixture out so we can suck new stuff in and do it all again!
The key to this whole operation is making sure the timing of that spark is on cue. A fraction off and you get an engine that is working against itself, which will cause a loss of power and choppy idle. A little more off and you can get some serious fireworks when you don’t want them! No spark? Try testing your coil!August 29, 2020 at 10:56 am #963397
Thanks for the info Richard 👍 i do know little about timing … yes i do know that my V6 3.5L has the Interference style of timing belt setup… a little prognosis … my 2006 Acura MDX 3.5L had died while driving dont know why.
So pushed off to side of road and collected a friend to tow it home … ps
Ps i purchased this CUV with a bad misfire ,which i had cleared mostly up buy general maintenance ie spark coil and oil but inwanted tontry to regain some more performance and fuel economy so intryed to clean with intake spray .. while engine off . So I ended up cleaning well enough but did research and found out Acura\Honda 3
5’s bad PCV issue turns out i cleaned too well and caused my valve to stay open amd for oil to be sucked in to the cylinder and burn causing it to smoke .. but i digress
am a one man I be it idiot… but i had sparyed intake cleaner in the top EGR passageway on my engine as a solvent to try to fix a bad misfire. .. now i did dry towl all of the intake/carb cleaner up… and waited another two weeks and installed a fresh starter on to engine .. at which time it did start but would not idle , and i had to get my vehicle moved from the center of my drive way. The only way to achieve this was to stand on the throttle and trow it in to gear and move it ..
Now a weeks time and i go to start to show a friend what it is acting and all it does is backfire compression (enough to kick the intake snorkel\tube off throttle body)..
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