My SVX is all better!

Thanks everyone for all of your help! I installed a new injector and now she's runnin smooth again!

Just have to get my CV boot fixed now. :roll:

Either way I am a very happy Scoob owner again.

 

If you suspect injectors; dont waste your money swaping around a brand new one.

Do an OHMs resistance test on all of them and check vs the specification values Sometimes we dont have the specification values If they are all about the same then they are all good. However one might have significatnly higher resistance than the others and BAM you found the culprit.

There are lots of things you could check out doing an OHMs resistance test and checking vs. specifications. I'm sure there is also a way to pull your codes and see if that gives you some clues. Check on the USMB; I bet someone has asked on there or knows how to do it on an SVX.

Good luck!

 

Does the SVX drive fine after you pick up some speed?
How many cylinders are affected by the misfires?

 

If the injectors check out, check the fuel line pressure, maybe your fuel pump is having problems.

The fact that the problem appeared after it was sitting, rather than while you were driving tends to make me rule out something like lost compression or slipped cam belt, neither of those are really gonna just appear when you start the car.

Good luck.

 

Thanks guys. Yeah after a while it goes back to normal power and the CEL flashes and then it gets weak again. I would assume only one cylinder is affected but I don't know for sure. I don't think it's a fuel pressure thing though.

 

I should say it goes back to normal power by surging and then going week again. Both when I am pushing the throttle and at idle.

 

my dads car had a misfire and it through a CEL code. all that was needed to fix the problem was a new set of plug wires. you might want to take out the plugs and see if you get good spark through them.

 

Yeah it might be one of the coils. So, how do you test coils?

 

my dad's 300ZX was running weird for awhile, and I found that the coil wire (spark plug wire from coil to disty) was shorting to ground. maybe it's something like that. have you replaced the wires recently?

 

Having a jammed/defective idle air control valve will cause the engine to:
Idle very rough
Have a fluctuating idle
Throw misfire codes to all 4 cylinders
Run on limp mode until you're up to speed

In my WRX motor, my car would idle at 1300rpm and randomly bounce up to 2000rpm. The car would cruise just fine, but 1-3rd gear acceleration would be very rough. P1507 was my code. At idle, the mechanic found that there was only injector pulses on cylinders 1&2 and not 3&4. He later found out from Subaru mechanics that in limp mode, 3&4 would not work at idle. I cleaned the IAC valve with throttlebody spray and that didn't work. What I did at the end, was replace my IAC with a friend's and the car ran perfect (make sure you have an extra IAC gasket with you. you don't want any air leaks). Unfortunately in my brother's RS, I couldn't find the IAC on the TB. The WRX's IAC is right on the top of the TB so it was very easy to swap. I do not know the location of the SVX's IAC from lack of an SVX to play with.

 

Kickin_81 I'll look around on the web for where the IACV is, then I'll look on the car. Thanks Morgan, I'll check the electrical too on the injector leads. Chux I haven't touched the engine honestly aside from changing the air filter and the oil prior to all of this.


Another thing is that when I think back, I remember the car having a low/weak idle after starting it up for the past month or so. I didn't think much of it, I thought I just needed spark plugs. I should've listened to the early sign. I still don't know what the cause is but maybe that helps those who can diagnose with these symptoms.

Thanks again


Does anyone know how to test coils? Do I take it off the spark plug and stick teh voltometer in it?

 

I think I figured it out. First, I didn't even bother with the IAC because as I thought about it, I knew it was misfiring not an air issue. Partly because it still was out of balance when I pressed the accelerator. So I went to checking the injector connections with the ohms and as I unplugged them the engine responded with less power...except for one. When I unplugged the drivers side front injector there was no response. So, I thought it was the coil but, when I unplugged the coil as the engine was running, (had to start the car then take out the battery) the coil was sparking plenty. Then I figured it was the injector so I swapped sides with another injector, started the car and unplugged the injector I thought was foul and there was no response. I unplugged the good injector in the foul one's place and the engine weakened. I believe it is a faulty injector and I am going to go use my parts discount to buy a new one now. We'll see how it goes. Wish me luck!