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Old 07-22-2009, 12:22 AM   #1
573
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Location: Troy, Michigan
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1994 LS1 Miata
2015 white WRX

Default TGV deletes, and then a boat load of fail. Please help make my car run nicely again.

My radiator developed a crack a few days ago so I figured I'd do the TGV delete mod while I was waiting for the new one. I thought everything went smoothly, but then I ran into problems when I tried to start the car.

At first, it wouldn't start at all. (I put the key to the on position a few times to prime the fuel system first) Well, it would fire, but then cut out immediately. I looked around and saw that the hose that went from the driver side rocker cover to the metal line that bolts into the intercooler was disconnected. I tried again, and it started up. The problem was that the idle was wandering from 500-3000 or so. Not only was the idle wandering, it was very rough too. This worried me so I shut it off and looked around some more. After a pretty thorough inspection, I decided to let it run for a while longer to see if the problem would remain after warming up. The idle wandered a bit less(went up to 2k rather than 3k), but it was still rough, almost like the sound of aggressive cams. The check engine light did not come on at any time.

My car isn't heavily modded. I have a 3" turbo back exhaust, STi top mount, XPT stage 2 map, and a few misc things that aren't relevant to this.

Here is a video of what is going on. This was taken after the car was a little warm. Notice the popping noises, wideband reading(22.4), and the rough/wandering idle. I did not touch the gas pedal in this video. This is also the first time it has stalled like that.

My thought is that it isn't getting enough fuel. That would explain the high a/f, and the stall. Other people have reported wandering idle after this mod so I'm not too concerned about that at the moment.

If anybody has an idea as to what the root of this could be, please let me know. I don't think I missed any connections, but it's certainly not an impossibility. Is it possible that the tune is at fault? I've been happy with my XPT map for a while now, but I'll contact a tuner tomorrow to get their take on it.

Thanks in advance.
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Old 07-22-2009, 12:24 AM   #2
apexslider
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does your map support removing the TGV's?
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Old 07-22-2009, 12:33 AM   #3
573
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Default

Quote:
Originally Posted by apexslider View Post
does your map support removing the TGV's?
Yes. I checked before I did the mod and all the codes pertaining to the TGVs have been disabled. The check engine light did not come on either. That being said, I do not think that the map was put together with TGV deletes in mind, as it is just an off the shelf stage 2 map.
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Old 07-22-2009, 12:39 AM   #4
Prevent
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Quote:
Originally Posted by 573 View Post
as it is just an off the shelf stage 2 map.

this....
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Old 07-22-2009, 12:41 AM   #5
573
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Quote:
Originally Posted by Prevent View Post
this....
Lots of people have done this mod without changing their tune and have not had problems. Also, unabomber's FAQ thread states that besides deleting the CEL codes, additional tuning is not required for this mod. I'm not opposed to getting a professional tune, and I probably will in the near future. I'm just saying this because I think there is another problem.
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Old 07-22-2009, 01:14 AM   #6
STIBungy
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You have a leak somewhere in the intake manifold.
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Old 07-22-2009, 01:52 AM   #7
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Quote:
Originally Posted by Prevent View Post
this....
put a sock in it.

Vac leak. You're pulling in air after the maf, so the ecu is only dumping enough fuel for part of the air, hence, crap idle.

Double check everything you touched post-maf, including all TGV/manifold bolts. Brake booster, purge valve, breathers, fuel pressure regulator, bpv hose, etc..

I once forgot the purge valve vac line (front center of intake manifold) and it produced the same results.

Last edited by Merp; 07-22-2009 at 01:57 AM.
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Old 07-22-2009, 08:11 AM   #8
STIBungy
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Yep. On mine, I forgot to connect the PCV line that goes to the fitting under the IM.

Quote:
Originally Posted by Merp View Post
Vac leak. You're pulling in air after the maf, so the ecu is only dumping enough fuel for part of the air, hence, crap idle.

Double check everything you touched post-maf, including all TGV/manifold bolts. Brake booster, purge valve, breathers, fuel pressure regulator, bpv hose, etc..

I once forgot the purge valve vac line (front center of intake manifold) and it produced the same results.
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Old 07-22-2009, 03:30 PM   #9
573
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2015 white WRX

Default

Thanks for the help. It was the PCV line under the manifold.

The car is running great now, and the idle stopped wandering.
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Old 07-22-2009, 04:33 PM   #10
[D.I.]WRX
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I was just about to say that....Same exact thing happened to my car. I just plugged it up so it wont happen again
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Old 07-22-2009, 05:31 PM   #11
WRX 2002
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Had the same problem myself...
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Old 04-03-2010, 11:15 AM   #12
snowflowmfg
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OT but I like where you put your wideband meter.
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