Mod list -

Intake, DP, MP, exhaust, 850 primaries, pfc, and converted to non-sequential twins

Car wont go over 4 grand or .4bars of boost. And I mean will not. No matter what you do, thats all it wants to go. Exhaust putters when you try and exceed either. And its whichever you hit first - 4k rpms or .4bars of boost. After you try and floor it around like this it gives the car a lumpy idle. A real lumpy idle. It usually goes away after a minute of normal driving. Car pulls perfect vaccum at idle.

I've checked all the connections and all the vaccuum lines. Dont anyone tell me to do this. i've checked them 5 times over. I've ruled out its not my MAP sensor. Anyone have any ideas?

Vid of my trying to boost then trying to exceed 4k

http://home.satx.rr.com/mr3plus1/CIMG1157.AVI

Closer view. More boosting

http://home.satx.rr.com/mr3plus1/CIMG1158.AVI

My lovely idle afterwards

http://home.satx.rr.com/mr3plus1/CIMG1160.AVI

 

Do you get spark on all 4 spark plugs ?

I would start my search there (as flooring it would give it too much gas and flood the plugs, then they need some time to recover). It would also explain that there is not enough power to propell the engine past 4k RPM.

Maybe one of your coils is bad ?

 

maybe the car is in limp mode?

disconnect the neg terminal of the batt and step on the brake for 20 sec

 

A fellow FD owner suggested this, but another FD owner I know has driven around in limp mode. It wouldnt make boost. Mine makes boost. Also - I dont know why mine would go into limp mode. It did this all of a sudden.

 

I'm going to get new plugs this afternoon. I hope this solves it.

 

I had a problem similar to that a few months ago. I had very little boost and car only went up to about 3500rpm, and topped out at around 50 or 60 mph. It turned out that my fuel filter was clogged because of water in my gas tank.
Diagnosing the problem, they changed the spark plugs, and the car ran much better. Then they checked the fuel filter which was completely clogged. 120 miles later the same problems occurred, no revs above 3500, or much boost at all, brand new fuel filter clogged again and now a clogged injector. Then drained the gas tank and found 2 gallons of water in it mixed with a 1/2 tank of gas.
We're in the process of getting around $1300 in repair cost back from the gas station where I bought that tank of gas.

 

This makes me so ******* glad I keep my receipts. This problem did start not long after I filled up.

How did you completely drain the tank? Is there a way to test and see if there is in fact water in my tank?

 

I didnt drain the tank myself. It was done at the local mazda dealer. They ended up with a 5 gallon bucket that after it settled, you could clearly see about two gallons of water sitting at the bottom of the bucket. I dont think there is a way to test without draining the tank. I'm not sure how to actually drain it myself since I've never bothered to deal with that area of the car before, but i'm sure you could call up the dealership and ask them simply how to do it properly.

 

The mistake the dealer made though was not draining the tank in the first place. This caused the need for a second fuel filter change and a clogged injector. So the second repair was about $500 changing the filter and spark plugs, and the second repair costs about $800 (fuel filter/injector). So for money sake before you change the plugs and try to run it, drain the tank first. I never saved my receipt from the purchase but I always use a check card for gas, so it was clearly on my bank statement.

They claim its not their fault though, so its having to go to small claims court if they dont agree to pay by next tuesday I think. I've learned a lot about the way tanks at gast stations work though. Apparently there is always water at the bottom of each tank at a gas station from storm water runoff.

It might be wise to take it to the Mazda dealer though. They concluded that the problem stemmed from the gas and nothing else could have caused that problem. They are willing to testify in court on our behalf. So if you went to a dealer and they had the same opinion, you would have a professional witness if the gas company/station didnt pay up.

 

Anyone else have similiar problems. I dont want to bring my 7 to the dealership.

 

wtf??? you dont have to drain anything to see if you have water in your tank, you just take off the fuel pump holder thingy on top of the tank, under the rear carpet and just look inside, its a total of 2 eletrical connections, 2 hoses, and 8 phillips head screws.

 

so you think you can just look inside and see the separation of gas and water clear as daylight? Even if I did try and look inside there when it happened to my car, I dont think I would have been able to tell if some water was mixed with 8-10 gallons of gas. But, I'm not gonna put a gallon jug in to find out...lol