1g-gte running rich and bad idle

[79GT]

go with trial and error, it could be a range of things.

find someone around that has the same engine and is running fine. give them a carton, and over one week swap certain bits as discussed above and see if you solve your problem and they get the problem, or no change will give you a good indication of what is wrong. although most likely it is a combination of lots of different things. so maybe swap a whole bunch of things in the engine bay. and then slowly swap bits back one at a time, and see if the problem returns.

good luck guys, i hate the probs that come and go. huge pain in the ass.
Jamie

[Z2TT]

Thanks Jamie I might try find somebody around here who can help me out.

I found this thread by Lambolica about cleaning the Idle Speed Control Valve, and it might be useful to me and others here having problems.

http://www.toymods.net/forums/showth...ht=1g-gte+idle

[Z2TT]

Cleaned out the distributor cap today, no difference.

[79GT]

was the distributer cap dirty/messy......with the 5M in the Ma61, it was running like a pig with bad idle when we first got it, changed over the idle speed control valve, cleaned out the butterfly, and ran like a dream for a while. this being said it is back to being a bit of a pig, but ijust havent found the time to go an deal with it as yet. see if you can try that, possibly even pull it off and see if there is anything holding it open or what not.

good luck, keep us informed.

[JZA70R_92]

any leaks after AFM will cause it to run shitty check all cooler piping, intercooler for cracks etc

[Z2TT]

On my other thread "Comp sure + Blow off vent" I am at a point where the BOV does not vent, I have found that the BOV has a small small leak, dont know if this should make a huge different in idle as the leak is small, more info there :

http://www.toymods.net/forums/showth...t=41278&page=2 Post 25

The points on the distributor cap had some white corrosion, I cleaned that out but it did not make any difference.

Is there a cheap way I can pressurize the intake system to check for leaks, excluding turning the motor on and revving the engine.

Thanks for the support.

[Kedderz]

take off the bov, u run an afm.
take off the bov, the 1g never came with one from factory.

[Grega]

um, how old is the o2 sensor?
ever been replaced?

[JZA70R_92]

if the BOV is leaking then you have found your problem....BOV is not needed take that shit off!!! Air flow meter meters air and if the amount of air measured goes missing then engine runs shit as it puts in fuel to match "air" coming in!!

[Z2TT]

I fixed the small leak but it still idles a bit rough, dont think that was the problem as leak was small.

Kedderz Yeah I know my 1g didn't come with a BOV factory, but did it even with come a plumb back factory?

If I take the BOV off and have no Bypass or BOV valve, then wouldn't the engine still run rich when I take the foot off the gas because the measured air doesnt reach the engine when i close the throttle, it just goes back over the compressor blades and surges?

Thanks.

[LeeRoy]

Simple, remove the BOV, alternatively if you want to keep it then get one that can be plumbed back into the intake tract after the AFM.

It's quite simple, metered air is being lost.

ps this thread sucks.

Edit: If you want to test for leaks go to a plumbing shop and get a pipe cap the same size as the hose that goes on the afm. Tap a compressor fitting or fitting for a bike pump into it then with the engine off pressurise the intake tract and then listen for leaks.

[Z2TT]

I'll keep the BOV installed for when I want it, then I will get a bypass valve and install it before the intercooler, so I dont have to run a huge hose from the other side of engine bay to the AFM.

How would I go about modifying the rubber hose after the AFM and make a fitting for it so I can attach the outlet hose to it from the Bypass valve?

As for my idling problems, I'm going to clean out the ISCV, Check timing again and play with idle air mixture screw.

[mad1600]

One thing I might mention and not sure if your engine runs one and that is a cold start injector. Quite often on the other toyota models the temp sensor for cold start injector shits itself and injector either doesn't work or runs all the time. If it has one pull the plug off the injector and see how it goes. Just a thought...........

[Z2TT]

Good Idea,

I think The 1g/1g-gte engine does have them, located at the bottom of the intake manifold, but not 100% sure.

[LeeRoy]

Don't modify the hose, go buy some silicon and get a pipe made from alloy to attach to it. I'm sure you could dodgy something up with sikaflex or some other crap anyways.

Also, FFS listen to what everyone is saying.

1. Your car doesnt run properly.
2. It has been determined that the cause is the BOV
3. You still want to use it?

Seriously wtf? If you want to keep it then hook it up properly, if not then get rid of it.

Even if you only want to use it when your drifting into gutters or whatever, your engine is going to be being fueled incorrectly for the amount of air it is actually using.