Won't start after turned off for 40 min. - 3 hrs.

RAYTONDREAU

MEMBER
1988 MAZDA RX7
1.3L
RWD
MANUAL
100,000 MILES

The engine won't start after sitting a while. Plugs seem to get fouled, if removed and cleaned w/carb cleaner and dried car will start, it will also start by pop starting. Comp. Is good 90lbs on every pulse. When started cold smokes blue until warm will bellow out blue smoke during deceleration especially when cold. I have checked the oil metering pump and it seems to be metering to spec not sure I'm checking it properly using a Haynes manual #1419.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi:
I have to ask a couple questions. First, when you remove the plugs to clean them, are they wet with fuel, oil, coolant? As far as burning oil, with a rotary engine, the rotors have side seals which are meant to keep the regular lubricating oil from entering the combustion chambers, If one is worn, you will get oil will enter the combustion chamber and you will see blue smoke. And yes, it will be worse at start up and deceleration.

Since the problem happens when the engine sits, I don't feel it is the metering pump. On the flip side of the coin, since you are seeing blue smoke, it could still be an issue.

Let me know about the plugs.

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Sunday, December 29th, 2013 AT 5:37 PM

RAYTONDREAU

MEMBER
2 POSTS

The plugs are wet and black I think w/fuel and oil. The engine was rebuilt about 80000 miles ago but this car has always had this problem and seems to be getting worst. If I remember to hold the accelerator to the floor sometimes it will start, but when close to the 1 hour mark that doesn't even work.

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Monday, December 30th, 2013 AT 7:13 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

If they are wet with fuel, I have to question of the fuel pressure is within the manufacturer's specs. Have you checked that? When it is running, does it run properly? Any black smoke from the exhaust that would indicate a rich fuel condition?

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Monday, December 30th, 2013 AT 5:15 PM