Lately i have been noticing that when i am in first gear, say at a dead stop, pulling out of a parking space, or in bumper to bumper traffic with constant stop and go movement, my evo will sometimes drop in RPMs down to 0, and bounce back up, almost stalling. I'll start to feather the clutch out in traffic say, and i'll get on the gas just a tiny bit to move up one space, and then i push on the clutch all the way to put it into neutral and that's when these problems occur. It happens often in the above sort of traffic, and when maneouvering through tight slow moving parking lots or spaces. only first gear too! I don't get it. I do have an HKS sucting intake on the car, but i noticed the car doing this just as bad with the stock intake on the car. I noticed the car doing this worse after i put on my grounding kit, but the grounding kit i used was the dealer option, and i followed the directions to a perfect "t". There is not a single problem with any of the hoses, wires, vaccum lines, connectors etc... I'm good at working on cars, and trust me, i searched for anything but no problems visable under the hood.

Could this be a problem with either running too rich or too lean? I know the evo runs rich already stock, but an intake might make it run richer. But then again, i've read on here that putting a drop in filter has been dynoed to make the car run a bit lean, so i'm confused about the whole deal at present.

any info? I would greatly appreciate it. Also, i'm not a moron, and i do know how to drive stick, lol, so it's not me being a bad driver either.

thanks!

 

Do you have a BOV installed?

 

I sometimes have the same problem, but thats because I have a HKS SSQV installed w/o the recirc kit. I get the problem when I rev the car up to anything more than 2,000 rpms and put the car in the clutch. I can avoid the rpm's dropping by riding the gear down to about 1,300 or so. Hope that helps

 

stock BOV, hooked up to ricirculate the air like stock. It is worse with the AC on as well if that helps at all.

 

I see the same thing now and again... never actually stalls.. kinda feels like a car with a rad cam loading up. Could it be because the EVO runs so damn rich to begin with !?

 

Do you have a turbo timer on the car?? If the harness is not correct that could be contributing. Mine would stall out all together with my turbo timer connected, I didn't think that was possible.. but it seems my harness has two of the ignition leads reversed, and with it disconnected I have had no stalling or hesitation issues.... so far that is.

 

no TT here

 

you lost me on this one. did you mess with the stock valve?

 

no, i just stated that i hooked the BOV back up the way it should, because i had to remove it to install the HKS suction intake.
it did this completely stock, just not as bad or not that i noticed a lot anyway. it's actually pretty scary. I haven't had too much trouble with my TT, and i don't think it has anything to do with the problems because the car doesn't do it all the time, and it doesn't have anything to do with the king of problem that i'm having, so the TT is ruled out. It's either motor, or ECU related somewhere.

 

Mine stalled out on me before I ever had the turbo timer. It would crank up but would not idle unattended. Dealer said all they found was loose clamp on the turbo inlet that time.

It got worse after the turbo timer and would hesitate very obviously on the interstate transitioning from no throttle to part throttle. It seemed ok for a few days after the tt install but it stalled out on me again about a month after the first time. This time the dealer blamed the TT and charged me 450 bones. Said they swapped all parts related to the fuel system including the ECU and as soon as they hooked up the turbo timer it would stall out again.

It's been a couple of weeks now and I have left the TT and boost gauge unhooked so if it happens again I will get a refund and hope they can find the real problem.

Personally I think the stock diverter valve is sticking. In my case the dealer said that the ecu was shutting off the fuel driver signal for some reason.

 

for any confusion, there is no problem with the idle, it idles great all the time, it's only an intermittant problem when coming to a stop. I never have any problems with it actually dying, and or not cranking over.

I have a greddy TT on the car with a harness, no problems with the connection there. BUT, the timer does have that option to display the system's voltage. my voltage fluctuates in the range of 12-13.5. for some reason, i thought that a car's voltage should be higher than that, around high 13 to 14 or so. NOT O2 VOLTAGE, CHARGING SYSTEM VOLTAGE.

It seems to be most prone to stalling (see original thread) when the voltage is low in the 12s. I'm taking it in to see if the alternator or charging system is faulty in any way, since this is similar to the problems my old car had when the alternator and or battery were going out.

any more info would be great.
thanks all

 

hrmm i see it do that tonight, first time