Question about Pontiac Aztek
I have a Pontiac aztek. When I put it in gear it makes a misfiring sound that sounds like jiffy pop popcorn and has no power. When I put it back into park it smooths out and idles normal. Prior to this there were times when I was driving down the highway at 65-70 it would kick out of overdrive down into the next lowest gear. I would slow down to 40ish and it would run fine again for a few miles. I have basically rebuilt the whole top end of the motor. Head gaskets, valves, timing belt, all the sensors. **** thing has me stumped. Any Ideas?
Has any of the work been done by a repair shop or
just by yourself?
If a shop has been involved, I assume you wouldn't be here
Need to check for codes & work on & repair problems as you
Going to need professional test equipment & use expertise, to
figure out whatever is going on there
Posted on May 15, 2014
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Posted on Jan 02, 2017
SOURCE: I have a 96 Chrysler
excessive carbon in combustion chamber, when hot, pre-ignition occurs. try using high octane gasoline first, but wait until empty, before filling up. it will take some time before the new gaz gets to the engine as the gaz lines and pump still have the old gaz.
another possibillity is water in the gaz tank.
when cold the gaz enrichment might compensate .
Posted on Jul 19, 2009
You've replaced the timing belt as a prevention maintenance or it has failed? In case of failure was made also a valve job? Why changing the head gasket? Are the spark plugs and cables new? the answer will bw within these questions...
Posted on Dec 08, 2009
SOURCE: I have a 2004 Dodge
This presents a very unique and interesting problem.......the work originally performed on the vehicle is suspect, as the first instance of the vehcile slowing down, is very very very similar to a catastrophic engine drama, like a timing belt breaking, or if it did "skip" a tooth, WHY.......a timing belt does not skip a tooth unless it was not properly tensioned in the first place, or there is a problem with the camshaft or cranshaft gears themselves which would cause this.......so I am extremely cautious on their diagnosis of nothing being wrong......
As well as this
The 2.0 Liter SOHC and DOHC engines used in the Neon are interference engines. if the timing belt broke while driving there is about a 6 in 10 chance a valve came in contact with the piston. The only way to know for sure is to replace the belt and perform a compression check to see if any valves are not sealing, so I would ask them whether this was performed or not.
Posted on Nov 05, 2010
SOURCE: p38 misfires and pops when hot
it is possible that you have access carbon buildup around your valves or on top of the Pistons that gets hot and on cruise causes the engine to misfire.It is also possible that you have some water in the mix that is forced through under normal conditions that under cruise conditions is causing problems also.
Posted on Feb 19, 2012
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