Question about Cars & Trucks
Excessive spark knock when under a load
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: spark knock under a load
Definitely a timing issue,distributor,ignition module,possibly timing chain jumped a tooth.I would attach a scan tool and look at the timing the PCM is seeing when all this is going on.For the meanwhile,run 93 octane as it will help to ward off the spark knock.Spark knock is actually preignition,otherwise known as detonation,and it is very tough on the rod bearings and pistons
Posted on Jul 26, 2008
Your timing could be too far advanced, EGR valve could be stuck closed, engine could be getting too hot (antifreeze leak or stuck thermostat), or there could be excessive carbon buildup on top of your piston, causing a hot spot.
The most common cause ive found is a dirty or defective mass air flow sensor. You can try removing the sensor and cleaning it first.
Posted on Mar 30, 2010
1 Ignition system not operating properly
2 Dirtyor clogged fuel injector(s).
3 Low fuel pressure. Check for proper operation of the fuel pump and for restrictions in the fuel filter and lines.
4 Fuel injectionor engine control systems malfunction.
5 Vacuum leak at the intake manifold or vacuum hoses.
6 Restricted air filter.
7 Fuel pump or pressure regulator defective.
Posted on Dec 05, 2010
SOURCE: 98 toyota rav4 2 door
Welcome to Fixya
There are things to look at are the rear diff mount - which goes soft and allows the diff to rock/tilt back and forward. This can be stiffened by filling the bush with silicon gunge. next is to have a good check of the rear trailing arm bushes and suspension mounting bushes. Lastly, or maybe should be first as its the easiest to check.. make sure the rear hub centre nut is torqued to the right setting. If this has loosened off, perhaps through a little wear, than it can cause a clunk when the car is on a ramp.
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Posted on Jun 17, 2011
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