Question about 1996 Mazda 626

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Mystery 1996 Mazda 626

The engine rocks realy bad when started. The timing belt marks (I and E) on crank face each other perfectly, crank on mark, and #1 piston all the way up. New spark plugs and set at 1-3-4-2. A fuel injector that had a cracked plactic cover replaced (getting desperate), new air filter, MAF cleaned, no check engine lights. Exhaust system checked for leaks and tighted. No intake leak. There are vacuum lines not connected by the timing belt cover. One has a blue dot, one has an orange dot, and one has a yellow dot. Under the car there is another one with a red dot. None are connected and book doesn't help on where they connect. Could that be the problem?

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  • CharmedBells Aug 17, 2008

    Forgot to tell you car has 150 compression all cylinders

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Well you have good compression so your cylinders are OK.
I cannot help you with the vacuum hoses, but, try and plug them because if they are sucking air they will make the mixture weak and that will cause the engine to run badly.
To be honest if it is rocking about as much as you say then I would suggest it is only running on three cylinders. If you are happy with the sparkplugs and HT leads then it has to be a fuel problem, the injector with the broken plastic part? are you sure its operating correctly?

Posted on Aug 18, 2008

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Posted on Jan 02, 2017

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