[someaussieguy]

Hey Guys,

On an impulse I bought a 1994 LWB vitara, which the previous owner had put a jap import 16v efi g16a engine in. I got it cheap as it has a few problems, the main one being a big off idle hesitation. I am going around the engine bay looking for vacuum lines that are missing etc and I have found this (photo below). Can someone please tell me what that is, and where the line should go?

I also suspect a faulty TPS, but being a g16a efi, I can't actually find a part anywhere to replace it with, no listings for a g16a TPS that looks like mine. Does anyone else have this same motor and know where I could get a TPS?

Any help is much appreciated!




Cheers
Josh

[jdk81]

While its a g16a block, thats g16b efi.
Most likely just bolted the 16v g16a in and continued to use all the original efi stuff.

That's egr.

Check it here http://www.suzukiinfo.com/
Link you're after is the g16b mpfi (posted by nicbeer)

As per tps, Id be looking at normal vitara ones.

[someaussieguy]

Awesome, thanks jdk81, glad to hear it is g16b efi as that will make getting parts a lot easier.

Does anyone have an opinion whether this could cause the off idle hesitation? Alternatively, anything else I should be looking at?

Cheers

[jdk81]

If it's the vacuum hose straight off the manifold, yes it will cause issues.
If its on the egr side, itll only cause issues when the egr would be open (at certain gears).
Try plugging the hose from manifold (essentially removing the egr part) temporarily and see how it goes

[someaussieguy]

So I've been pulling my hair out with this thing, fiddled with the TPS to no avail, cleaned AFM and throttle body and checked that everything is moving fine, no codes on ecu. It appears that broken black plastic bit may never have had a hose on it? I can't see where it would have gone and I am pretty sure I have the right number of vacuum lines coming off everything. Any suggestions for someone to take it to on the Gold Coast who would know how to test and adjust TPS/EGR/ISC/IAC?

Cheers

[Rhinoman]

That VSV may just have had a cap/filter on the top of it. The TPS needs to be adjusted correctly but you may find your problem is spark related, have you checked the spark plug gaps? You should also do a compression test.

[BenT]

That hose #26 that looks like its going underneath the solenoid should actually go to the broken port on the solenoid. The other end of the hose taps off the throttle body, so is very likely to be causing a big vacuum leak at part throttle and causing your hesitation.

I'd get that fixed or at least plug the hose before I fiddled with anything else.

Ben

[christover1]

My 93 LWB Vit has a G16A import fitted. (Swift 4x4 was written in chalk on it)
I used all my G16B add on bits onto it, so that's what I shop for when needed.

[someaussieguy]

Thanks for all the advice guys, I probably should have put a little more information in my first post, the car has brand new plugs in it, leads look ok, new air filter. I've cleaned the throttle body/intake and checked all parts are moving ok. The hesitation only happens when going from no throttle to any amount of throttle, ie. foot completely off the pedal, then applying any amount of throttle from that point will cause an initial hesitation. Once the hesitation has passed the engine revs freely and feels fine until you take you foot of the throttle. It also doesn't matter what RPM you are at, going from no throttle to any throttle causes the same issue. It is also idling rough when hot, and sometimes after about 25 minutes of driving, if I turn the car off, then back on again, it won't idle at all, it will just die instead of idling, but again, still runs fine otherwise.

That vsv/solenoid has two lines coming off it already, one at the side and one at the bottom. looking at diagrams I got the impression they normally only have two lines? I figured that the top part would have been a filter or cap, and have tried plugging it and seeing what happens but there is no difference. There are no open hoses or taps on the throttle body/intake.

One theory I have is that the TPS is buggered so it doesn't detect the initial movement of the throttle, causing the butterfly to be quite open before it thinks I am giving it any throttle, is that a possibility?

Cheers

[BenT]

I have a Jap import G16a 16 valve sitting in the driveway, and it has that hose #26 plugged into the top port that is broken on yours. The bottom port where your hose looks to be going has a plastic cap over a vent tube.

A quick google finds this pic, which looks just like how mine is setup:



I would take that hose #26 off whatever it is connected to and block it and see if that helps.


Ben

[Rhinoman]

BenT wrote:

I have a Jap import G16a 16 valve sitting in the driveway, and it has that hose #26 plugged into the top port that is broken on yours. The bottom port where your hose looks to be going has a plastic cap over a vent tube.
Ben

You are quite right, looking at those pictures I can see that the VSV is upside down compared to an 8V so the breather cap is at the bottom rather than the top.

[someaussieguy]

A quick update on this one, haven't had a chance to work on it much in the last few days but I did get time to change all the fluids, and when I was warming up the car and refilling the coolant, I noticed pretty much as soon as the thermostat opened the car's idle went from ok to pretty terrible in an instant. It's definitely pointing more and more towards and EGR issue in my mind. Apart from the VSV plastic thing, all air lines are plugged in and there are no vacuum leaks that I can find. This leads me to the obvious question, does anyone know where to buy an EGR VSV from? I am hesitant to call bursons/repco, because even if they have it I will be up for a fortune, otherwise I can try the dealer, but would prefer a cheaper option as would most I assume. have called a few wreckers but can't find a 16v vitara anywhere to steal one from.

Cheers

[someaussieguy]

In case anyone comes across this thread in the future, it had a really weird resolution, the fuel pump was stuffed. I have never experienced these symptoms with a bad fuel pump, but after giving up and taking it to a mechanic, he chucked a gauge on there just to be thorough and discovered that it couldn't hold pressure. Who would have thought?

Cheers
Josh

[Gwagensteve]

These cars are at an age where fuel pumps and especially fuel pressure regulators are now giving trouble.

[someaussieguy]

Gwagensteve wrote:

These cars are at an age where fuel pumps and especially fuel pressure regulators are now giving trouble.

Yeah definitely, I'm not so much surprised the fuel pump was bad, more so the symptoms it was causing are not what I have experienced in the past with a bad fuel pump.