Microtech Newly installed, no spark, low voltage while cranking
#1
Rotary Freak
Thread Starter
Newly installed, no spark, low voltage while cranking
I just swapped a series 4 T2 motor into my 85 gs (was carberated). My friend just finished installing my LTX 8. One problem, the system shows 12 volts at the coils with the key in the on position but once I start cranking the starter, the voltage drops to like 5 volts and of course, we don't get any spark. HELP! My car has been sitting for 2 years and I finally thought I would hear it run tonight
My friend thinks maybe the battery were using is not fully charged, or maybe for some reason, the starter is drawing too many volts. This is all he can think of at the moment. I am gonna try slow charging the battery all night.
Any suggestions?
Thanks!
My friend thinks maybe the battery were using is not fully charged, or maybe for some reason, the starter is drawing too many volts. This is all he can think of at the moment. I am gonna try slow charging the battery all night.
Any suggestions?
Thanks!
#2
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Join Date: Dec 2001
Location: Jamaica/Miami
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Try adding more groung wires.... https://www.rx7club.com/3rd-generation-specific-1993-2002-16/grounding-101-why-so-many-669814/
#4
Rotary Freak
Thread Starter
No, it's not the battery, the battery is good and drops to 10 volts while cranking while the coils drop to 5. Also we hooked jumpers up to a running car and still no luck. I'm thinking something in the wiring is wrong, or I don't know if it's possible for the starter to crank fine but draw to many volts away from the rest of the system. The microtech shows one green light when the key is on, while cranking we have the green light and the orange light goes on an off.
#6
Rotary Freak
Thread Starter
I got my car running!!!!!!!!!!!!!! Started it up with just the downpipe.....lol I could see the neighbor across the street jump out of his recliner when I started it haha.
Anyways, the Crank Angle Sensor was wired wrong!
On Microtechefi.com I figured out how to get the Microtech to do a self check so to speak. The Microtech acts as the crank angle sensor and fires off all of the spark plugs and injectors. Well, these all worked so I figured the crank angle senser was either wired wrong or bad.
When we wired it, we connected the red, green and blue wires that come from the Microtech to the red, green and blue wires on the crank angle sensor. Well, after putting the multimeter to them, we figured out that the colors didn't match what the wires actually did. So we repinned them and that took care of it. Thanks for the ideas guys! This car's been sitting in my garage for a couple years due to lack of motivation. After I heard that thing run, I couldn't stop smiling all night
Anyways, the Crank Angle Sensor was wired wrong!
On Microtechefi.com I figured out how to get the Microtech to do a self check so to speak. The Microtech acts as the crank angle sensor and fires off all of the spark plugs and injectors. Well, these all worked so I figured the crank angle senser was either wired wrong or bad.
When we wired it, we connected the red, green and blue wires that come from the Microtech to the red, green and blue wires on the crank angle sensor. Well, after putting the multimeter to them, we figured out that the colors didn't match what the wires actually did. So we repinned them and that took care of it. Thanks for the ideas guys! This car's been sitting in my garage for a couple years due to lack of motivation. After I heard that thing run, I couldn't stop smiling all night
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#8
Rotary Freak
Thread Starter
Yeah, I had all new fuel but it was slow to start. The motor had been sitting for about 10 years. (after solving the problem with the cas) we were trying to start it and it just wouldn't start. It would be like pop, pop, pop, like only one rotor was trying to start. After about an hour of messing with it, it started and ran smooth!
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