Question about Cars & Trucks
I have a 1998bmw 540i, I change plugs and because the was misfiring and shaking at a stop. I replace the plugs and now it is idling rough and check engine light came on. Also I notice I have. 2 crack injectors it is crack where the injector wire connects
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Posted on Jan 02, 2017
SOURCE: 99 buick Lesabre
hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
Posted on Sep 23, 2008
SOURCE: 1998 BMW Z3 1.9 Cylinder
Spark plug wires may be the cause. for cold damp start issues water is a conducter and will send spark directly to an engine ground not through spark plugs. also look for oil in spark plug wells this can also cause a misfire under certain conditions.
Posted on Oct 16, 2008
I would suggest you look at the Coil and leads first as they are more likely to give a misfire also check the spark plugs and clean?replace them,you could check the compression on the cylinders to just to make sure,if you need more help E-mail me and i`ll try and help further,be carefull as there is up to 80,000 volts coming down the HT leads.
Posted on Aug 04, 2009
The problem is a faulty solenoid in the vapor recovery system. The solenoid is sticking open and allowing fumes from expansion of fuel in the fuel tank to enter the air intake and smother the engine. This is how the Mazda service tech explained it to me. It is a known problem on the Mazda 3 in various trims which Mazda refuses to acknowledge. Usually the check engine light comes on and the engine diag code reads mass airflow sensor, which is incorrect. I dealt with this for 6 months on my wife's 2005 Mazda 3i before the dealership figured it out. My cousin bought a 2007 Mazda Speed 3 which developed the same problem after a few months and was cured by the same fix.
Posted on Aug 26, 2009
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