Hello, I'm in the process of purchasing a 97 protege and already noticed some minor problems with it such as the rough idle. When i bring the car to get checked is there anything specific i should be looking for on this generation of protege?
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the clogged up egr valve is a result of the compression problem...
the cylinder thats low on compression ends up running richer than usual, and when the rich exhaust gas passes thru the egr system it ends up clogging everything up
if there was no compression problem, there would also be no egr problem
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an interesting point triblade mentioned. for those who do not want to go the BP route and would still want to keep their proteges with the Z5. what kind of work to the engine are we talking about here to get the compressions right again? pistion rings and just valve seats?
1996 1.5L Mazda Protege DX MTX
Mods:
DX converted to an LX (F & R seats and All Power), 2" Exhaust from the Catback, EuroReverse Glow Gauges, JDM Clear Side Markers, 17" MB Motoring Rims, K&N air filter 33-2134, All Clear Lenses, Front Strut Bar, MS Sideskirts, JDM Taillights, JDM Turbo Diesel Hood Scoop, OEM Door Visors, and Ducktail.
http://www.cardomain.com/id/beetle_orange
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the lower half of the Z5 engine does not have any recurring problems, if someone is burning oil due to bad piston rings, its most likely either their own fault for poor maintenence, or its a very old engine
the low compression problem is due to weak valve springs resulting in burnt valves...
in order to keep the Z5 operating normally, you would have to remove the head and have a valve job done (seats regrinded and might as well change the seals while you're in there) as well as all the springs replaced
replacing them with oem springs will most likely allow the problem to happen again over time... if one could find slightly stiffer aftermarket springs, that might solve the problem
going too stiff will increase cam wear so you have to be careful here
other than that, if you're doing the work yourself and using genuine mazda parts, you're looking at around $550.00 USD (give or take $100.00... depending on how good of a shopper you are)
if you pay someone to do it, add roughly 8 hours of labour into it
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