Last post on Sep 19, 2013 at 3:03 AM
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Mazda Protege, Sedan
#2972 of 3742 91 Mazda Protege DOHC LX- bucking, missing solved!
Jul 05, 2006 (9:59 am)
My 91 Protege DOHC had an annoying random miss at idle. Under 2000 rpm in second or higher gears it would buck and miss at times, making driving annoying. These "fixes" solved the problem for me.
1. Even though plugs looked good, bought new KGB plugs and gave them proper gap.
2. The spark plug wires each run down a three or four inch plastic sleeve. Sometimes the wire can ride up in the sleeve and not make contact with the plug. I adjusted all of these to make sure that when the sleeve snapped into place that the wire was firmly on the plug.
3. Changed the distributor cap.
4. Scraped and cleaned the rotor lightly.
5. Checked rubber intake hose from air cleaner to intake manifold for cracks and leaks. There were none. Found four bolts missing on air cleaner cover and replaced them.
6. Added a five ounce bottle of Lucas injector cleaner.
7. Spark plug wires looked new so they were not replaced.
The car now is totally smooth and without a miss at idle and no bucking at all even when pulling at 1,000 rpm in second or higher gear. It is a delight to drive and like a different car. Sometimes at idle it is so smooth that you don't know the engine is running. Good luck!
#2973 of 3742 Re: 91 Mazda Protege DOHC LX- bucking, missing solved! [lifeisrich1]
Jul 05, 2006 (12:02 pm)
Hopefully you meant NGK plugs.
#2974 of 3742 Check engine light and low engine RPM unstable
Jul 05, 2006 (3:57 pm)
My 2002 at 60,345 mi with only plugs changed at 32,000 mi. Problem showed within the last week, rainy. Going in for attention and TLC tomorrow. My guess is 1)plugs early 2)ignition wire harness 3)pollution sensor at end of life. Hopefully the error code will tell the story get it fixed and back happy on the road again, zoom, zoom.
Any feedback as to failure would be appreciated. I will log what was found. Thanks all. Now back to my Bike, Yamaha Silverado 1600cc. Another fun toy!
#2975 of 3742 Re: No start when hot [harbiho]
Jul 05, 2006 (9:17 pm)
Okay.....so finally fixed this!!!
No-start was a result of a bad cam sensor.
Heating was because of a bad thermostat.
#2976 of 3742 Re: I need some serious help [kjam143]
Jul 07, 2006 (3:48 am)
I've got the exact same problem with my 96 Protege DX. I've been told replacing the EGR Booster will fix it but it didn't. I've been trying since April. If you've found out anything, let me know.
#2977 of 3742 Re: I need some serious help [kjam143]
Jul 07, 2006 (7:51 am)
Heavy smoke at start-up could be caused by leaking valve stem seals. This would allow oil to leak into the combustion chamber at start-up. I'm guessing this would make the car fail an emissions test if it was done on a cold engine. Did your mechanic discuss this possibility?
#2978 of 3742 electrical problem with my " 91
Jul 09, 2006 (2:16 pm)
the lower passenger compartment got flooded and now the car won't start. the automatic seat belts won't activate and there is no power to the starter. all the other electronics seem to work. i've discovered a circut board underneath the drivers seat with a wire bundle into it that appears to have fried. what is this board? it has a part number on the case but i can't seem to locate what it is, or what it's function is.BR70 67 780. Is there an aftermarket source for this? Is it likely to be my electrical problem. Thanks for your help.
#2979 of 3742 Where are the spark plugs and wires?
Jul 11, 2006 (7:37 am)
'99 LX 1.6L w/ 119,000 miles. I've had some major mis-firing issues and noticeable loss of power lately. I took it to a shop and they recommended that I get the plugs, wires and coil replaced, which should take care of the problem. I'm always trying to save a buck or two and I was going to start by replacing the plugs and wires myself. After looking at the engine, I can't find the darn plugs! I'm no mechanic, but I've replaced those before on other cars and they're nowhere to be found. I had a repair manual already covering models thru 2000 and the pics don't match what my engine looks like.
Anybody know where I should look and how easy is it to replace them? Maybe recommend a website with pics that could help me? Thanks in advance!
#2980 of 3742 Re: acceleration, & knocking noise issues.... [mazdrvr]
Jul 11, 2006 (1:28 pm)
Does it have manual or automatic transmission? If it has automatic you may want to flush/fill your transmission fluid to remove hesitation.
#2981 of 3742 Re: Where are the spark plugs and wires? [pingman3609]
Jul 11, 2006 (7:53 pm)
Plugs are in recessed holes between the two overhead cams. I believe they are covered by the coil packs on your model, so you may not easily see them.
The '95-98 models have a distributor with wires that go to the plugs. Yours may be distributorless, I don't know.
You might want to vacuum out the spark plug wells with a small tip nozzle before removing the plugs so that no junk falls into the cylinders. Also, make sure to give the plug wires a good push onto the plugs. It should make a popping sound if they are on good and tight. Finally, use a light coat of anti-seize compound on the new plug threads. This will make it easier to remove them next time.
Bosch plug wire are around $50 and come with a lifetime warranty. Make sure the plug wires (when installed) don't touch either the valve cover (hot) or any hard edged component. Use the seperator clips provided and/or electrical tape. Slight wear on a wire's protective insulation over time will cause a plug wire to fail.
Make sure to put the plug wires back in the same location you removed them so as not to mess up the firing order. Have fun!