2nd Generation Specific 1986-1992 Discussion

Low Compression Again.

Old 03-18-2004, 03:25 PM
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So I finally wired in the 10ohm resistor into the injector power wire because of the wrong impedance cleaned injectors I put it in. Pulled plugs, cranked, cleared the chambers of fuel. Turned the fuel pump switch off, and turned on the starter/charger. Cranked, cranked, flipped switch, nothing. Won't start, tries hard but just won't. I'm puzzled at the moment, it has a mazdatrix fuel bleeder, cleaned/bench leak tested injectors, it should not be flooding. Swapped ecus, still no go. Tested for spark, and saw smoke coming out the tail pipes. So I decided to pull out the compression tester. 100-100-100 front. 75-35-75 Rear. Rear rotor exhaust port was white when I got the motor, I did verify all apex seals were in place. Seems taht the rear rotor apex seals are a little weak and a side seal/corner seal is shot. BigT said he heard a weak chamber when we turned over the motor about a week ago or so.... I should have listened. But anyhow Its getting pulled tommorrow, cleaned this weekend. I just have to order the clearance tools, and I should have it back in within a couple weeks. I have a rebuild kit at home here. Large streetport will be in order too.
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Old 03-18-2004, 03:33 PM
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I think you should get it running before you pull it, it will run with those compression #'s... try some MMO, a seal could just be sticking in teh compressed state, side seals like to when they're carboned up.



unless you're looking forward to a 2nd project car, and would rather rebuild & port it, though if you port it you'll likely have to upgrade turbo side of things too. even the stock setup experiences boost creep without a ported wastegate with free exhaust, add a port to the mix and see what happens.
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Old 03-18-2004, 03:43 PM
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I had it soaking in MMO while it sat...



This thing is AWFUL hard to start, I mean damn this is rediculous.
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Old 03-18-2004, 04:09 PM
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yeah get it running first see what else is wrong.
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Old 03-18-2004, 06:35 PM
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Pull it off! That will get it turning fast enough to start it.
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Old 03-18-2004, 07:10 PM
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Originally Posted by wanta be boosted' date='Mar 18 2004, 07:35 PM
Pull it off! That will get it turning fast enough to start it.
If I turn my start to 125amp it spins awful fast.
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Old 03-18-2004, 09:21 PM
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are all the basics covered?



a dead battery wont start a car no matter how much

you try boosting it
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Old 03-18-2004, 09:21 PM
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Originally Posted by Rob x-7' date='Mar 18 2004, 07:21 PM
are all the basics covered?



a dead battery wont start a car no matter how much

you try boosting it
yeah i think theres something else wrong
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Old 03-18-2004, 09:35 PM
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this kid has been working non-stop on this car for the last 2 weeks, he has checked coils, cas, injectors, ecu, ****** everything. the known history of the engine leads us to believe that it has been running lean for some time yet it started and ran fine before it was shipped here. the engine was sitting with mmo in it for about a month or less before we even got to start it. so if the engine has mmo in it, timing is dead on, everything has power, spark+fuel+air+flooding= probably a blown engine. but those numbers should be adequate enough to run....
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Old 03-18-2004, 09:37 PM
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try a fresh battery that come out

a running car, and double check all connections
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