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2nd Gen (93-97) I4 2.0L Discussion of Maint Issues for I4

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Old October 23rd, 2017, 08:40 PM   #1
RyanT
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Join Date: Aug 2009
Location: Manitoba
Posts: 414
2.0L crank no start

Hello all,

I used to run a KLZE. I had 5 or 6 Mazdas in total. That was years ago.

I'm trying to help a friend with his 93 2.0L MX-6.

I spent some time with it tonight and I have some information, but no solution:

-Cranks, no start
-No codes. Pulling MAF plug yeilds a code.
-All fuses are good. jumped the engine ignition relay, no change.
-Disty rotor turns with cranking.
-No fuel or spark - although there is a weak spark when you stop cranking.
-Removing disty and spinning rotor by hand does run pump and injectors - forgot to check for spark.
- 12V on IG- in DIAG box - seems strange to me.
-Really weird voltage readings across injector (unplugged). No consistent GND or 12V on either pin. Voltage is really all over the place, positive and negative.
-No continuity to ground at IG-. Jumping IG- to ground yeilds a small spark at the jumper, but no change.

Since the voltages are weird on the injector and the IG-, I am thinking it must be a sensor ground issue, or an ECM.

Thoughts?
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'93 1.8L BP MX3 - black - RIP
'93 2.5L ZE MX3 GS - black - RIP
'92 2.5L DE MX3 - Red - RIP
'99 M3 - Stock
'03 EJ20K swap Forester (Xti)
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Old October 24th, 2017, 10:20 AM   #2
BoostedMan
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cps, or ground
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Old October 24th, 2017, 10:41 AM   #3
RyanT
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Join Date: Aug 2009
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I am confused why you can hear the injectors firing in turn when spinning the disty manually, if it requires the CPS?
__________________
'93 1.8L BP MX3 - black - RIP
'93 2.5L ZE MX3 GS - black - RIP
'92 2.5L DE MX3 - Red - RIP
'99 M3 - Stock
'03 EJ20K swap Forester (Xti)
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Old November 7th, 2017, 09:31 AM   #4
RyanT
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Join Date: Aug 2009
Location: Manitoba
Posts: 414
Turns out it was the distributor - surprise.
__________________
'93 1.8L BP MX3 - black - RIP
'93 2.5L ZE MX3 GS - black - RIP
'92 2.5L DE MX3 - Red - RIP
'99 M3 - Stock
'03 EJ20K swap Forester (Xti)
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