radiantRX-7

iTrader: (1)

I just had my engine rebuilt buy pettit, Had new rotor housings and aggressive street port by Mazda Trix. Single turbo 500R by A-spec. full 4" exhaust. Stock map sensor.

Cam said he cleaned the injectors, they are still the stock ones. I have a Apex stand alone. Right now I'm over seas and my good friend went to go pick up the car and said that cam was putting in spark plugs as he showed up. So apparently I have new plugs in there.

Now before everyone comes in and says that my friend is abusing the **** out of my car don't please. I trust him 120% with it and know he will not. He knows he has to break it in for 1,000 miles. So far he is up to about 760. But all of the sudden this starts happening.

He says 1st off that its hard to start ie. it does the click and nothing then it will turn over. But recently he was driving back home, he put it in (N) and it stalled. He then tried for 5 times till it turned over. It was cranking but not starting on him. When it did start it made a loud back fire and shot out black smoke.I read in a recent post that it can be the injectors being cleaned and they could have become stuck.

He hasn't check the map sensor hose yet. But he will soon. I doubt that will be it though, cause he hasn't driven it hard. Also he says that when it gets to a 1/4 tank it runs very bad. I have the OMP removed and add 1 oz. per gallon of premix. I haven't changed the oil out yet either. I know it should be done at 500 miles.

One other thing it has been raining a lot in FLA and the car was in the garage, I was wondering if the condensation was fouling the plugs? Maybe I need to get a dehumidifier in there?

I wish I was there to check it out but cant right now. My friend is on the west cost. And Cam is in West Palm so its a far drive to go to just check it out.

Thanks, Jason

AnthonyNYC

iTrader: (3)

I think you should call Pettit and explain the situation and see what they think it is. It's always a good idea to let them know of an issue asap before trying to troubleshoot on your own. Since you are far away, they will probably ask you to check a few things.

Do you have any check engine lights?

Anthony

radiantRX-7

iTrader: (1)

I called him and told him , and he doest know. He said maybe the plugs. If I remember right the throttle position sensor was bad or getting stuck, but I don't think that will cause it not starting 5 times. I wish I can remember if I replaced that but don't remember. No check engine nights come on.

radiantRX-7

iTrader: (1)

I think the TPS or the idle adj. screw needs to be adjusted. he say sthe idle is low.

djseven

iTrader: (56)

I assume it is the cleaned injectors leaking or getting stuck open. I recently had 30 injectors sent off and cleaned. I have had about 3 of those injectors leak externally out of the top and had about 5 of them become stuck open within the first couple hours of driving. The back fire was the car being flooded which is what happens when an injector is stuck open when the car is shut down. Usually the fuel system will maintain the fuel pressure for a short time and then bleed off. However, with a stuck injector a lot of the fuel that is left in the lines goes thru the stuck open injector and sits in the combustion chamber. When you start the car it will smoke horribly and a lot of the times back fire if the plugs even have the ability to start the car.

Sounds like a sticking injector, you should have an aftermarket FPR with your setup and should be able to tell if you have an injector sticking open when you shut the car off, if the fuel pressure drops down to 0 in less than a minute then you know you have a leaking injector. If it holds pressure for 15-20 minutes like it should that still doesnt leave out the possibility an injector is getting stuck and becoming unstuck intermiddently.

Tell him to prime the fuel system, and see if it will hold pressure through your aftermarket FPR gauge. I highly doubt your friend is abusing the car, welcome to the fun stuff that takes place when you take a car that came from the factory with 215rwhp and try to nearly triple that

djseven

iTrader: (56)

Before adjusting the TPS check the voltages on the PFC commander, it is simple and you can do a search here on the forums for the correct voltages, sorry I dont have the link saved.

Likely the TPS is not the issue but can sometimes be, I would simply adjust the idle screw and then contact Chuck Westbrook here on the forum and buy his notes about properly adjusting the idle. I would figure out the issue with the fouled plugs before I wasted time getting the idle perfect.

radiantRX-7

iTrader: (1)

I have a FPR the one taht came with the RX-7 store ultimalte fuel kit, but dont ahve it installed. Can my friend just conntect that and see, w/o installing everything else?

djseven

iTrader: (56)

As long as you trust him to do that kind of work. Just have it install it in the return line right near the intake elbow before the throttle body and make sure it has a pressure gauge on it also

radiantRX-7

iTrader: (1)

Not sure how to do that myslef. Damn.So he needs to drill into the intake elbow?

radiantRX-7

iTrader: (1)

Also if the injector was stuck open will he smell a lot of raw fuel? He says he only smells oil. The oil smell is from him pouring 12 oz. of premix. Since my OMP is out.

djseven

iTrader: (56)

No, No, No No drilling. This may be beyond what you/him is capable of doing safely. You have to install the fuel pressure regulator and gauge in the fuel return line to check pressure. The easiest way to do this is install it between the two hard fuel return lines if you still have the stock hardlines on top of the engine. He should smell fuel on startup if the injector is leaking when the car is off, however, it will burn off in a matter of seconds if it doesnt foul the spark plugs.

radiantRX-7

iTrader: (1)

Can you please send a pic. where the two hard lines are located?Does the UIM have to come off?
Thanks for the help

radiantRX-7

iTrader: (1)

Im trying to fugure out how to adjust the TPS through the PFC.

djseven

iTrader: (56)

You do not adjust the tps thru the PFC, you can however check the voltages and see if they are in the correct range.

You should not need to remove the UIM to hookup the FPR but you will need to remove the intake elbow. I would take the car to someone who is familiar with them and have them take a look at it. If you are on the east coast there are shops all over that can work on these cars.

radiantRX-7

iTrader: (1)

Thanks thats the answer i was looking for, So I have to adjust it threw the tps behind the UIM. http://www.fd3s.net/tps_adjustment.html .
I will try to find out the reading on the PFC and see. As far as intalling the fFPR i dont think my friend will do that.

He is on the west coast of Florida.

radiantRX-7

iTrader: (1)

This is the part im confused about though.
Before checking the TPS, first set the throttle body to ground zero, what i mean by that is totally close the air adjustment screw that is on the underside of the throttle body, and also adjust the scew on the top of the throttle body so that is does not hold the butterflies open, in other words, so that it just touches the throttle linkage just as the butterflies are fully closed. I got this idea from erics info on this thread:
Does the uim have to come off?

radiantRX-7

iTrader: (1)

Would the check engine code come on if the injectors were leaking/stuck open?

djseven

iTrader: (56)

No CELs if the injectors are having issues. You may or may not have to remove the UIM to adjust the TPS, it all depends if it has been adjusted in the past. However, if your car is singled it should only take literally 4-5 minutes to remove the UIM. I suggest removing it, loosening the two screws/bolts that hold the TPS in place(dont remove them, simply loosen them) and slightly adjust the TPS, when you go to put the UIM back on, only tighten the top screw/bolt on the TPS so it will be easier to adjust once back in the car.

David

Howard Coleman

iTrader: (6)

"aggressive street port by Mazda Trix. Single turbo 500R by A-spec. full 4" exhaust. "

"they (fuel injectors) are still the stock ones."

first off, if Cam built your motor you have something first class from a first class guy. congratulations on making a good decision.

that said, what are you doing w a stock fuel system? a GT500, 4 inch exhaust, large ports and 2800CC/Min of fuel?????????

sure you are breaking it in but you have a time bomb just waiting to melt apex seals if your right foot gets a little heavy. you need 850/1600s at minimum.

i suggest you park your FD until you can put a proper fuel system on it. then get it tuned and enjoy.

howard coleman

radiantRX-7

iTrader: (1)

Howard, thanks for chiming in. I have the stock injectors in yes, but just till i beak it in. Arent the stockers good for 350whp? I'm only running 9psi. The spring in the waste gate will not let it go about that.Shouldn't I be good?

I have 850/1680 waiting to get put in along with Aqua mist meth kit. But cam said no need to right now if your breaking in the engine. I have to get this done asap. I'm going to Steve Kan's tune on the 11th.of Oct.

radiantRX-7

iTrader: (1)

Thanks for the info. DJseven.

Busted7

I belive alot of your problems will be gone after oct 11th.
Tunning when done right makes a world of diffrence.
Good luck.

radiantRX-7

iTrader: (1)

Yes sure they will be, but I don't think Steve will bother trying to fix the TPS when its there right? I really don't want to go there and the car isn't up to snuff.

I assume that the car has to be ready 100% and he just adjusts simple things. I will be great if he can figure out why It stalled and didn't start 5 times in a row.

stylEmon

iTrader: (2)

You would be surprised at how many guys go to tune their cars and all they end up doing is working out bugs. Things usually don't goto plan. I would suggest you get your fuel system installed, and work everything out prior.

Busted7

Try and have everything ready but hes used to last minute repairs.
Adjusting the tps isn't that big of a deal. Its just kinda hard to get to.
The fuel is a big deal if its not right it will limit the amount of power he will tune for
and it needs to be done prior and tested for leaks.