1990 Mazda Miata engine problems - Engine Troubleshooting


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1990 Mazda Miata engine problems

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Harmitt
New User

Oct 6, 2012, 8:23 PM

Post #1 of 5 (7882 views)

1990 Mazda Miata engine problems	Sign In

I have a 1990 Mazda Miata with a 1.6L engine with 209,000 miles on it. It sputters and has no power during acceleration. When it get to about 3000 rpm it goes pretty good. I feels like it is missing. I replaced the spark plugs, wires, and air cleaner. It made no difference. I removed the cat converter thinking it might be plugged and started it up with it off. It still ran the same. A guy at the parts store said he thought it might be the coil. I checked to see if there were any fault codes, it blinked twice. The number 2 fault code is "no NE signal". I researched that and it is a signal that comes from the cam position sensor. I unplugged the cam sensor and the car wont start with it unplugged. Can anyone help me know how to test a coil and cam position sensor. They are quite pricy and I dont want to replace them if it is not going to fix the problem. I would appreciate any help!

91 Isuzu 4ex1
Novice

Oct 6, 2012, 9:06 PM

Post #2 of 5 (7859 views)

Re: 1990 Mazda Miata engine problems	Sign In

Have you done a compression test?

At that mileage it might be time for new rings.

Just a thought.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 7, 2012, 7:42 AM

Post #3 of 5 (7835 views)

Re: 1990 Mazda Miata engine problems	Sign In

If you unplug the crank angle sensor, the engine definitely won't run or will stall. The crank angle sensor has two sensors built in. One is the G sensor that detects TDC and the other is the Ne that detects crank angle at 180 degrees.

You need to have someone test the Ne signal coming from the crank angle sensor using a oscilloscope and make sure it is reaching the ECU.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Harmitt
New User

Oct 7, 2012, 10:25 AM

Post #4 of 5 (7826 views)

Re: 1990 Mazda Miata engine problems	Sign In

Do most repair shops have an oscilloscope, or do I need to take it to a dealer?

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 7, 2012, 10:49 AM

Post #5 of 5 (7819 views)

Re: 1990 Mazda Miata engine problems	Sign In

You might be able to find out by calling some of the shops in your area.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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