My 88 n/A vert has a viscious flooding tendency. It only happens about once every 2-3 months and when it does it's a bitch to start. It usually takes about 3o minutes of trying (about 20 actual start attempts). This happens after a long drive of any kind of driving (not the usual on-off thing). I've got a fuel pump cut off which is the only way it starts, but it still takes quite a bit of finess to get it going.

I checked my compression and it's great 115-115-115. My mechanic thinks it's leaking injectors. My question is what is the mechanism? Does the fuel left in the rail after the car is shut off just drip out the injectors while the car is off? Will cleaning them stop the leaking?

Thanks for the help

 

cleaning them wouldn't be a bad idea. Not likely that it will continue to drip after the car is off, but that they are injecting too much when you go to start, could be sticking. http://www.cruzinperformance.com can help with the cleaning part, and i've seen some where on the web an "H" value that you can use to check if you injectors are leaking, it released the line pressure when you turn the car off. I think mazdatrix has it, not sure though

 

Your seals (o-rings, grommets, and one other thing) could be bad. I had problem with leaky injectors too a while back. I replaced the seals and it helped immensely. Although it wouldn't hurt to have them cleaned too. I got a whole set of seals for all 4 injectors from my local Mazda dealer for about $36.

 

So "leaking" and "dirty" are two different problems?

FC-Irea: did changing the o-rings, etc stop your's from flooding?

How hard is it to get the injectors out?

It sure seems like mine is flooded before I even crank it once (I can tell by the sound).

Why do they only flood occasionally?

 

Why do my alarm, door lights and power antennae only work occasionally? It's an RX-7... accept it and move on.

 

Quick solution if you're willing to do a little teeny bit of wiring.

Find the power line to the fuel pump (runs right behind the driver's elbow, around the shock tower and to the tank).

You'll have to trace it carefully and/or have a diagram.

Install a switch under the carpeting (low-profile switch) behind the driver's seat where you can reach it easily, in the power line for the fuel pump.

Then, whenever you turn off the car, first switch the fuel pump off, let the engine die a second later, and then turn off the key.

It will never flood again, there is no pressure in the line. In addition, no one can hotwire your car and drive it away with no fuel pump!

It's not the most transparent fix, but it's a lot cheaper than new injectors (plus installation) or an upgraded ECU (I know someone who modifies the ECU to drop fuel pressure when you turn the car off), or even Mazdatrix's fuel bleeder.

 

I've already got one, but thanks

 

It's not overly hard to get the injectors out. The PITA is removing the UIM and its associated vac lines. More than likely they'll be brittle and break when being removed... so stock up on some new line before you re-install the manifold. I followed the procedure listed in the FSM and had little difficulty with the R&R. If it's your first time removing the UIM then I would label all the vac lines and be concious of check valve location and direction. Have fun!