?Startup Issues - WTF?

[miltont]

Still having the problem?

Man, no love?

 

[Kooldino]

Yeah.

 

[miltont]

Im having weird idle problems, yesterday i was @ the dyno and my car was @ idle and suddenly we heard your pop sound, we noticed in the back side where fuel pressure regulator is, a thing that is similar to a (Wastegate) where the secondary runners are, activating. That should not be activating itself.
Im looking for more info on this type of problem.

Yeah.

 

[Kooldino]

Im having weird idle problems, yesterday i was @ the dyno and my car was @ idle and suddenly we heard your pop sound, we noticed in the back side where fuel pressure regulator is, a thing that is similar to a (Wastegate) where the secondary runners are, activating. That should not be activating itself.
Im looking for more info on this type of problem.

At idle though? My car does it on Key ON, before the car is running.

Can you post a pic and circle the thing that's activating?

To me, it sounds like VTCS (internal WG looking thing on the passenger side), and that SHOULD activate itself.

 

[Metal MP5]

cant remember how i got to this thread but just wanted to know if you ever figured it out?

 

[Metal MP5]

OMG memory sucks lol ... i got here from a link you posted in Linux' thread lol

 

[green dart]

i assume the mpi is a controller that controls the extra injectors, maybe you mpi is malfunctioning and when the engine is shut off the extra injector sprays some fuel into the cylinder just before or just after the engine stops turning, when you go to turn it on the ecu energizes the spark plugs and ignites any fuel in the cylinder and if the valves are open will backfire into the intake thats where you get pressure on the boos guage. try to turn the mpi off just before you shut off the engine and see if it happens again.
If thats not it maybe it sprays fuel just as you turn the key to the on position .

 

[Kooldino]

This same problem occurs with the haltech EMS on other cars.

 

[StealthWyvern]

Did you ever get this problem solved?

 

[Kooldino]

Nope

 

[PGFracing]

Have you solved this problem yet. My car is doing the exact same thing. It went bad the same time the transmission blew a seal and went bad. I put new plugs in that helped a little but it still won't idle right and have to give it gas to run right. Have you come up with any solutions yet? To me it sounds like it's igniting to early, like the timing is off on just that one cylinder. The one closest to the oil cap.

 

[PGFracing]

I put in a pretty much new EGR valve and the problem went totally away. It wouldn't even idle before, now runs perfect. I suspect you have the same problem. Sounds just like mine.

 

[Kooldino]

Hmm, I don't think we have the same issue. Could you describe yours in detail?

 

[nvmsp]

Hey, my car does that pop s*** too. Just started not to long ago and I have no idea what it is.

 

[nvmsp]

I was thinking maybe it's the exhaust, a nice little backfire to start the day. ?


Or already took off the heatshield to check for a cracked or loose manifold but it's not cracked or loose.

 

[PGFracing]

Mine would run if I would keep the rpms up around 3,000. It wouldn't start unless I gave it a little gas. From reading your posts it sounds very similar to mine. There is a post that says you can clean your EGR valve and it will work. More than likely your EGR valve is stuck open. It's not the easiest thing to get to. I had to use an air wrench along with a universal joint to break the bolts loose. I also had to remove the battery to get a good angle on the bolt. It's about an 1 hours work, 2-3 hours for a first timer. I'm nearly positive thats your problem.

 

[Kooldino]

Update:

If you install a J&S safeguard in between your EMS and the coils, you will NOT get the quick spark on "key on". I have a feeling that this will disable the POP from ever occuring.

Furthermore, when I tested this on the car with the safeguard, I wired the Safeguard to the red wire with the white stripe that powers the fuel pump. I found this wire under the cup holder.

So either the J&S Safeguard natively intercepts the quick spark, OR, you may be able to wire your EMS the that red/white fuel pump power wire to avoid the spark on "key on". Experiment and post your results here.

 

[Maxx Mazda]

So after reading all of your findings, I would suggest pulling the MPI injectors and looking to see if fuel squirts out when the MPI is switched on. That might help narrow it doen a bit.

 

[Kooldino]

IIRC, in the past I tried pulling the electronic plugs from the MPI injectors and it still did it.

 

[Maxx Mazda]

IIRC, in the past I tried pulling the electronic plugs from the MPI injectors and it still did it.

No ZZL for me.

I didn't try the injector unplug thing, only because it's a pain to do evey time (it would take about 3 mins to pull every time i wanted to do it...the plugs are hard to get to).

I jsut mean removing the injectors from the block physically, leave them plugged in and see if you get fuel squirting when you turn the key. You've narrowed it down to something with the MPI, correct?