jkimbro

iTrader: (3)

Okay, this freaking sucks. I just got my car tuned the way I want, it's running great. The engine has roughly 15,000 miles on it (stock 2mm seals from Mazda) and was running extremely strong all the way up to the time I parked it. I drove it to work on a Friday, and let it sit all day on Saturday, then tried to start it up Sunday afternoon.

It turns over just fine, but it won't fire. At first I figured I just had a clogged fuel filter so I wasn't too worried. So I pulled the fuel filter off, and it his little/no resistance when blowing through it. When I pulled the hoses off the fuel filter, there was some fuel, but it wasn't pressurized or anything so that led me to the fuel pump.

I changed out the fuel pump, and now it seems as if I'm getting fuel (when I pull the fuel hose off the filter now, it's definitely pressurized).

I also changed out both of the coilpacks, still no luck. Anyone have any sugguestions? I'm worried that it might be something compression related....because I have been running a bit higher boost (14lbs) than I've been told 2mm stock seals should be handling.....but this has only been for the last 1000 miles at most.

Any input would be greatly appreciated.

Thanx.

rrx777

there is a 90% chance it is flooded pull the egi fuse crank the the car then put the fuse back in. If that dosent work try to push start it. if it still wont crank pull the egi fuse crank the car with the gas all the way to the floor for 15 sec, then put the egi fuse back in and crank like normal.

jkimbro

iTrader: (3)

Yeah, I wish. That's the 1st thing I tried.....and the 5th, and the 10th......and the last thing I tried. Still nothing.

Everytime I changed out a part, I re-did that 'cause I figured whatever I just tried would have probably flooded it.

rrx777

how about injectors, can you smell raw gass?

jkimbro

iTrader: (3)

That's odd that you ask that....'cause I found that kinda weird that I didn't smell any gas while the engine was cranking. That's what pointed me to the fuel filter/pump.

I wouldn't have thought it could have been my injectors.....I would have figured that they would have gotten weak and I would have noticed a performace drop first...before they all in all quit. I'm running 550 primary, and 720 secondary......for starting purposes the 550's are the only ones used, right?

I have a pair of 550's from when I threw in my 720's I could try....

rrx777

does the tack bounce at all whe you try to crank it, and yea the 720S dont come n till 3,800 rpms i think

jkimbro

iTrader: (3)

I'll check to see if the tach moves....I don't recall it moving when trying to start, but I don't remember looking for it specifically.

I saw in another thread that if the tach bounces, it shows that I'm getting spark, right? I have tried another leading and trailing coil pack out of my parts car...

Thnx..

jkimbro

iTrader: (3)

Okay...I'm still at work, but I had the wife go try and start the 7, and she said that the tach doesn't move at all. What do I need to look at, or does this point to anything specific at all?

Thanx.

jkimbro

iTrader: (3)

Okay, I just got home...and tried it myself. The tach does jump when trying to start the car. I cranked it over a few times, then pulled all of the plugs. ALL of them were wet w/gas, so this is telling me that I'm getting fuel all the way to the plugs.

I'm getting spark from the leading coil, 'cause it shocked the **** out of me the first time I cranked it over.

I'm not seeing any spark on the trailing coil, but in reading another thread if the tach moves when attempting to start, this tells me that I'm getting spark there.

I'm running low on ideas...someone throw me a bone.

NorNor01

Hi, I'm having the same problem with my '90. Please let me know if you get any new suggestions. Do you have a fuel cut-off switch? I think that's my next move....

ImprezedRS

Pull the egi fuse and spark plugs, crank it over a few times to get all the fuel out, then pour about a ounce or 2 of premix into the spark plug holes, crank it a couple more times with the egi fuse and spark plugs out, spray the sprak plugs with some carb cleaner let them dry then reinstall the spark plugs, crank it a couple more times with the egi fuse out, then put back in fuse and try starting it.

That usually worked for me when i heavily flooded the motor.

RETed

Can you list all the mods on your car?

It sounds like it just flooded majorly, but this shouldn't be happening.
Can you do a compression test?
What about a quicky one just to verify all 6 apex seals are okay?


-Ted

jkimbro

iTrader: (3)

My mods are relatively small, but have led to higher boost.

I'm running a custom 3" intake with the Bonez cone filter...no air pump. I'm running a 3" downpipe, then 3" x 30" glasspack, then I kick the 3" pipe out from underneath the passenger door. I'm using the original S-AFC, and AVC-R from apex-i. I'm using 550cc primary, and 720cc secondary injectors.....running NGK all 9's. I've also installed a BOV off a 1st gen eclipse. Also running an FCD, becuase all of the intake/exhaust stuff led to a ton of boost.

From time to time it will flood out, and I'll pop the fuse, crank it...pop the fuse back in and it will start. BUT, this normally happens after I've driven it for a while, turn it off...then jump right back in it. This time, however, I drove it on a Friday....let it sit all day saturday, and most of the day Sunday. I don't think I've ever had to do it after an almost 2 day sit.

I don't know how to do a compression check, and don't know if I'd even have the tools to pull it off.....

RETed

How is your S-AFC set?


-Ted

jkimbro

iTrader: (3)

as far as +/- ?

When the BOV was installed, the car totally ran like crap for a day or two, until I started playing with the SAFC. It was getting a TON too much fuel. Then it was set to +14% or so. After playing with it over the next couple of days, I got it back down to an overwhelming -22% then it ran great. Even as much as -15 to -18 I was still running extremely rich. So, currently (if i remember correctly) the LOW setting is around -16, and the high setting is -22.

I did change out my fuel pump....you think that maybe it was going haywire on me and that's why I had to adjust the SAFC that way?

RETed

Okay, I just want to verify...550 primaries, right?

What kinda fuel pump are you running now?

The S-AFC adjustment doesn't make any sense - you should not be off by 10% if anything.

Is that DSM BOV open-vented???


-Ted

jkimbro

iTrader: (3)

Yeah 550's are my primarys....

My fuel pump is a standard Mazda one out of my parts TII.

I didn't install the BOV...a guy that works on nothing but RX7s installed it a few months back (I've been unable to get ahold of the guy, which is why I'm turning to help somewhere else)

I think he adjusted the BOV to where it's completely closed off until I let off of the boost.

RETed

Um, how do you adjust it so it's totally sealed?
IIRC, the DSM unit cannot be adjusted?
There's a "mod" which crushes the spring loaded side, but I still think it leaks.

Verify this by taping the open end up to see if this changes or fixes your problem?


-Ted

jkimbro

iTrader: (3)

thnx. I'll give it a shot.

digitalsolo

iTrader: (2)

Sounds like you might have a rotary.

Have you pulled your plugs to see if they're wet? I haven't seen that mentioned here. Would be a good place to start.

Do you have access to a fuel pressure gauge that you can plug in and check that with? Auto parts shops should have them for ~10 bucks.

The thing to always remember is you need three things to start. Fuel, air, and spark. Obviously you seem to have air/spark, so that just leaves fuel (well and compression technically, but we're assuming on that one ).

rrx777

you should not run four 9"s unless you are around 350-400 hp, check you afm connector and crank sensor.

jkimbro

iTrader: (3)

It's in there...I'm getting gas to the plugs. I've had my Rx7 for 6 or 7 years now....and it's never done this. Usually it's flooded and I do the fuse trick to get her going again, or it's something that I can figure out relatively quickly. This one has just stumped me.

rrx777

weak starter, bad wireing, I would do a comp check just for the hell of it, then try to roll start it, have you ever had the injectors cleaned? after I got my t2 it flooded realy realy bad all the tricks to unflood did not work, it took me almost four days before I got it to crank just be patient and repeat the unflooding procedures several times.

jkimbro

iTrader: (3)

It's fixed!

I'm gonna guess that somewhere in the fuel pump dying and getting replaced, it flooded the crap out of the engine. To where none of the tricks that you guys suggested worked.

I finally got a hold of my local guy, and he told me that if I've tried all of those other tricks, to push start it. Son of a gun worked like a charm. It ran like crap, of course, until all of the excess fuel got burned off...but we're all set now.

Thanx for everyone's help. New tip for the future, "Go push your car off a cliff, and pop the clutch half way down."

Red Star

[QUOTE=rrx777]there is a 90% chance it is flooded pull the egi fuse crank the the car then put the fuse back in.


that mostly works 100% percent of the time