90' Intermittent power - Spark problem - Page 2 - ZR-1 Net Registry Forums

JerryRig · 5 Days Ago

Quote:

Originally Posted by Thomas ZR-1

What about the spark plug electrode distance? Are they all similar? I gap them to 1.25 mm = 0.05 inch as Marc recommends.

They are the platnium plugs that Marc recommended on his site, I don't know the number off- hand. I did gap them to .05

JerryRig · 5 Days Ago

I think I'm making some progress. It's been right in front of my face for awhile now, I think it's the Camshaft sensor. I had got a Code 31 in the past.

I unplugged the sensor and It seems to run great now...I ran it for 30 miles like this. Idles smooth no abnormal sounds and goes through the gears cleanly.

I cleaned the leads up a bit and zip-tied connectors together(connection seems to be a tad loose)

I just took it out for another drive with it plugged in. No SES light for at least 15 miles, runs smooth like it should.

I might be in the market for the rare Cam Sensor.

DRM500RUBYZR-1 · 4 Days Ago

Perseverance, attention to detail and a plan pays off again!

Well done!

Marty

RSLyrick · 4 Days Ago

Good job!

Is there anyone who can explain the connection between camshaft sensor failure and such issue ?

The book gives the following description :

This signal is used by the ECM to synchronize Sequential Multiport Fuel Injection (SFI) mode of operation with the intake valve opening.

The camshaft sensor is located in the left camshaft cover/cylinder head between cylinders three and five. The sensor is a Hall-effect design with a magnet molded into one end. The Hall-effect is powered by ignition voltage and has its own ground. The left exhaust camshaft has a round reluctor wheel with one notch machined into its perimeter. The notch is used to locate cylinder #1 on it?s compression stroke. When the notch passes through the Hall-effect switch, ignition voltage to the ECM is
pulled low. The camshaft signal voltage transitions, from high to low, is a more precise indication of exactly where the intake valves are located and is used by the ECM to calculate the Sequential Multiport Fuel Injection (SFI) mode of operation.

It seems more related to fuel injection than ignition.

5 Days Ago	#12
JerryRig Join Date: Aug 2024 Location: Leander texas Posts: 10	Re: 90' Intermittent power - Spark problem I think I'm making some progress. It's been right in front of my face for awhile now, I think it's the Camshaft sensor. I had got a Code 31 in the past. I unplugged the sensor and It seems to run great now...I ran it for 30 miles like this. Idles smooth no abnormal sounds and goes through the gears cleanly. I cleaned the leads up a bit and zip-tied connectors together(connection seems to be a tad loose) I just took it out for another drive with it plugged in. No SES light for at least 15 miles, runs smooth like it should. I might be in the market for the rare Cam Sensor. Last edited by JerryRig; 5 Days Ago at 04:25 PM.

4 Days Ago	#13
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, NJ Posts: 2,630	Re: 90' Intermittent power - Spark problem Perseverance, attention to detail and a plan pays off again! Well done! Marty

4 Days Ago	#14
RSLyrick Join Date: Oct 2023 Location: Germany Posts: 35	Re: 90' Intermittent power - Spark problem Good job! Is there anyone who can explain the connection between camshaft sensor failure and such issue ? The book gives the following description : This signal is used by the ECM to synchronize Sequential Multiport Fuel Injection (SFI) mode of operation with the intake valve opening. The camshaft sensor is located in the left camshaft cover/cylinder head between cylinders three and five. The sensor is a Hall-effect design with a magnet molded into one end. The Hall-effect is powered by ignition voltage and has its own ground. The left exhaust camshaft has a round reluctor wheel with one notch machined into its perimeter. The notch is used to locate cylinder #1 on it?s compression stroke. When the notch passes through the Hall-effect switch, ignition voltage to the ECM is pulled low. The camshaft signal voltage transitions, from high to low, is a more precise indication of exactly where the intake valves are located and is used by the ECM to calculate the Sequential Multiport Fuel Injection (SFI) mode of operation. It seems more related to fuel injection than ignition.