fiav block off questions [Merged 11-8]

[96whgsx]

I did a boost leak test recently and I found a very good sized leak probably on the TB shaft seals. So, I'm just going to replace them and while the TB is off, I was deciding whether I should block off the FIAV and blocking off both the FIAV and ISC. I know that some people have had trouble with cold starts on cold days but the weather here doesn't go below 50 F so, I'm not too worried about that. Also, the vfaq for removal/bypass of the FIAV isn't working, so I have yet to read an write-up/article on this subject. I do know that you can JB weld one of the ports or buy a blockoff plates and re-route the coolant lines to bypass the throttle body. Thanks in advance for the replies.

 

[mnetwork]

I'm looking into eliminated my FIAV just for whole intake temp aspect. People only sell bypass/blockoff plates for 1gs. This web site sells a plate too DSM THrottle Bodys and he says it works for 2gs also. He said the following when I emailed him; "The only difference in the FIAVs is the water tubes on a 2G FIAV are a little smaller than the ones on a 1G. There's really no reason you would need to have 2 blockoff plates for 1991-1999 TBs."

Does anyone else know about this?

 

[andy4g63]

This guy from DSM Throttle bodys, knows his stuff. You have reason to believe what he is saying. If you have a chance give him a call.
There is a difference between bypass/blockoff plates. The bypass plate is still to keep idle speed motor / ISC. The blockoff plate is to completely eliminate ISC. In both case you get rid of coolant lines to and from TB. JMF also sells these plates. Call Jim and ask him.

 

[turboglenn]

While were on this subject whats the issue with just removing the coolant lines to the TB and leaving the rest of the parts intact?

 

[99gst_racer]

I was always under the impression that both generations used the same FIAV block-off plate.
I have a few of each TB in my garage, so I'd be able to verify in a few hours.

This is the block-off plate that I use, but I use it with a 1G throttle body.

While were on this subject whats the issue with just removing the coolant lines to the TB and leaving the rest of the parts intact?

I use the block-off plate just to eliminate clutter. It looks better without the FIAV and it's easier to work around it.

 

[ZmanIV]

While were on this subject whats the issue with just removing the coolant lines to the TB and leaving the rest of the parts intact?

You will never melt the wax pellet and stop the high idle.

 

[turboglenn]

Hmmm. i wonder if this is part of the reason i can't get a god cold idle for the first 30 seconds or so? I removed my coolant lines ages ago, but later the same year when it got cold my car became a PITA to get going in the cold and still is to this day( i fidgured it was because there was no coolant flow, but thought it was just to do with temperatures ).

is there a link that shows this wax pellet? I'm going to go look on vfaq real fast and see.

 

[andy4g63]

While were on this subject whats the issue with just removing the coolant lines to the TB and leaving the rest of the parts intact?

In my case, even though I got new/Remanufactured TB, I was changing the intake manifold and I saw poodles of antifreeze inside IM. You know, water is not compressable, so I just got rid of the coolant lines.

 

[bling5tatus]

Don't most stand alones idle high during warm up to speed the process? My car warms up pretty quick, but I've got some warmup fuel enrichment going to aid in a speedy warmup. If the car is completely cold it will idle at 2k, but after it's at operating temp it's right at 1k... which is still slightly high, but it's fine for me.

 

[turboglenn]

Don't most stand alones idle high during warm up to speed the process? My car warms up pretty quick, but I've got some warmup fuel enrichment going to aid in a speedy warmup. If the car is completely cold it will idle at 2k, but after it's at operating temp it's right at 1k... which is still slightly high, but it's fine for me.

Yes, they do, but mine takes a good 30 seconds before the motor will rev up to that point unless you were to give it some gas and hold it for a fe seconds (like 15 seconds at 1500 RPM). It's like it barely runs for the first 30 seconds, then once there's some warmth in the motor it idles up to warm up like it should. I mean it literally is probably at 300-400RPM for those first 30 seconds and it's loping like mad at that time... Like i said it's only been doing it since removing the coolant lines to the TB, at first i thought it would tune out but it won't so there must be comething else going on letting either too much or not enough air in.. NO matter what i set the ISC's bsae opening setting to it doen'st effect the engine untill it decides it wasn't to rev up

 

[mnetwork]

Yeah. Talked to JMF before.. they said they actually never tested it on a 2g because when they made it they didn't have a 2g TB lying around. And Steve at Throttle Bodies says the bolt pattern is the same. Looks like I'll be purchasing a bypass plate. I'm not getting the full blockoff because all I want to get rid of is the coolant lines, but I want to do it the right way and not get an idle problem.

 

[mnetwork]

I ordered a bypass plate last night... I'll let everyone know how it goes after I install it...

 

[Hiitman]

I'm going to be moving back to Colorado and I was wondering if getting a fiav block off plate would be a good idea. Anybody in any of the cold states doing this? And if so what are some of your cold startup issues?

 

[illeffekt vr-4]

I'm in NYC and its pretty bad here in the winter time. Never had the FIAV hooked up on any of the dsm's I've owned and so far no issues.

 

[xveganxcowboyx]

It's annoying, but unless you're way up in the mountains it shouldn't be too bad. You'll need to keep your foot on the gas a little for the first minute or two. Do you have a compelling reason to block it off?

 

[Strm Trpr]

So, did you get that by-pass plate installed yet?
Did you get the plate that retains the function of the ISC?
Let us know what's up.

 

[blcknspo0ln]

Not only is eliminating the FIAV a great idea, in my experience it has created the best idle the car has ever been through.

 

[Strm Trpr]

Tom, did you use the JMFab by-pass plate that retains the function of the ISC, or did you do the entire Block-off?
How's starting the car in cold Jersey mornings?

 

[blcknspo0ln]

I tried both from JMF. The ISC/FIAV blockoff was pretty hectic to get the car to catch an idle in the morning. I had to hold the throttle down for at least three minutes before it would idle correctly and the car liked to die whenever I took the car out of gear at cruise, coast to a stop, or in parking lots. With just the FIAV blocked off, the problems seemed to stop (occasional stall, probably due to the cams and my retarded left leg), but idle has been spot on and it catches idle within 5-10 seconds of cold startup.

 

[Strm Trpr]

Perfect, that's what I wanted to hear.

 

[99gst_racer]

Tom, where you using Link to simulate idle when you had the ISC/FIAV blockoff?

 

[blcknspo0ln]

Tom, where you using Link to simulate idle when you had the ISC/FIAV blockoff?

yes I was even trying to compensate with idlecoastFC but that didn't work either

 

[mnetwork]

I have my bypass plate, I just ordered two FIAV gaskets and I'm waiting on those... I'll post my results after I install it. To me it just seems like such a great idea to get the coolant away from the throttle body.

 

[bmoha2]

I could see going for this. Looking forward to updates.

 

[mnetwork]

yes I was even trying to compensate with idlecoastFC but that didn't work either

If weather permits I will be installing my bypass plate tomorrow. What EXACTLY did you do with the coolant lines? Did you just remove one of the lines and loop the other?

 

[woooop]

Leave them alone, dont cap them.If you want to clean the area up alittle more buy the plate that replaces the whole lower portion of the throttle body.