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Discussion Starter · #1 ·
Hi everyone, so we have an issue with our Vitara since Saturday, actually the issues started about a week before, but Saturday was when it really got so bad that I couldn't get it started. Sounds like she is running on 1 cylinder on cold start, she eventually starts running on full cylinders the warmer she gets and needless to say she is using a lot of fuel. Black carbon emissions spitting out of the exhaust. We have changed all spark plugs and cables to distributor, we have cleaned the carb (not the original as we had similar issues last year and replace the carb) She is regularly serviced with all new filters, etc. So my question is, where should we start looking to solve this?
 

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Welcome to the forum. I would assume that your engine is not carb, but is an 8v throttle body. Or have you modified the engine with a carb?? If not, is the check engine light on with the key on, and then off when cranking?
Have you ever cleaned out the EGR valve and the pipes going to it? The EGR valve has a diaphragm on it, and if the diaphragm is stuck in the forward position, the car will struggle to start and run.
I suppose there are a number of things to check and diagnose, but all of them are based on the engine/valve timing being correct. I’d probably start with a compression test on the engine - all plugs out, the F1 fuse removed to stop spark and fuel, a well charged battery, and floor the gas pedal while you crank about 5-6 times for best compression. If you do the test, post your results. On your cold 8v engine, you should be getting about 150psi on all cylinders.
 

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Discussion Starter · #3 ·
Welcome to the forum. I would assume that your engine is not carb, but is an 8v throttle body. Or have you modified the engine with a carb?? If not, is the check engine light on with the key on, and then off when cranking?
Have you ever cleaned out the EGR valve and the pipes going to it? The EGR valve has a diaphragm on it, and if the diaphragm is stuck in the forward position, the car will struggle to start and run.
I suppose there are a number of things to check and diagnose, but all of them are based on the engine/valve timing being correct. I’d probably start with a compression test on the engine - all plugs out, the F1 fuse removed to stop spark and fuel, a well charged battery, and floor the gas pedal while you crank about 5-6 times for best compression. If you do the test, post your results. On your cold 8v engine, you should be getting about 150psi on all cylinders.
Hi Bex,

No, this vehicle is carburetor and came out like that originally, we only replaced the existing carb as it's internal components were worn and we couldn't get any parts to replace them. Check engine light is not on. Thanks, let us start with your suggestions. Do carburetor engines come with EGR valve and where would we find that?
 

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If it has a carb there will be no check engine light or FI fuse.

8v Vitaras were supplied in many markets with carburetors, not all vehicles were fitted with EGR, I would suspect the south african market models did not have them, but that would have to be visually confirmed, maybe Bex could find you a picture showing what it looks like and give you an idea where to look.
 

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Do you know what vehicle the carb that is currently fitted came from?

As Bex has suggested get wet & dry compression tests done, I'd prefer the tests done on a warm engine - I suspect you're going to find the numbers quite low.
 

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Discussion Starter · #7 ·
If it has a carb there will be no check engine light or FI fuse.

8v Vitaras were supplied in many markets with carburetors, not all vehicles were fitted with EGR, I would suspect the south african market models did not have them, but that would have to be visually confirmed, maybe Bex could find you a picture showing what it looks like and give you an idea where to look.
Thanks very much
 

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Discussion Starter · #8 ·
Do you know what vehicle the carb that is currently fitted came from?

As Bex has suggested get wet & dry compression tests done, I'd prefer the tests done on a warm engine - I suspect you're going to find the numbers quite low.
It is a toyota tazz carb, we think it is actually too small for the vehicle. We did now find that one of the jets is missing, so we are working on that now. Thanks guys, will update when we get to the bottom of the issues.
 

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I have a stock carbed 8V like yours and if you still have the original mikuni carb, i strongly recommend you get the overhaul kit, fix it and refit it (i can give you details were to get the kit). If you are not very expert/handy with carbs, you might need a carb specialist to do it, quite easy to loose tiny parts, but thats about the only donwside IMHO. In the mikuni there are just a few parts that wear there, typical top class Japanese build quality.
the toyota carb can be made to work well in a vitara, but of course the poor thing needs the right jets to do its job. the smaller size will only hurt top end power...
 

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If you have lost a jet, the engine will be flooding.. besides that, you do not want loose parts floating around the intake..
 

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Discussion Starter · #11 ·
I have a stock carbed 8V like yours and if you still have the original mikuni carb, i strongly recommend you get the overhaul kit, fix it and refit it (i can give you details were to get the kit). If you are not very expert/handy with carbs, you might need a carb specialist to do it, quite easy to loose tiny parts, but thats about the only donwside IMHO. In the mikuni there are just a few parts that wear there, typical top class Japanese build quality.
the toyota carb can be made to work well in a vitara, but of course the poor thing needs the right jets to do its job. the smaller size will only hurt top end power...
Thanks please send me the details? We are in South Africa.....
 

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Discussion Starter · #12 ·
If you have lost a jet, the engine will be flooding.. besides that, you do not want loose parts floating around the intake..
Yes, we are aware that the jet will cause flooding, but we were wrong yesterday, the jet was still firmly in place. We did find a cracked distributor cable which we replaced (didn't fix the problem, but at least we could see that all 4 have spark). We are almost 100% sure it it the carb, so now we start trying to get that fixed as we will be replacing it with a Weber pretty soon but would love to get the stock carb back as turboguzzi suggested.
 

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Yes, we are aware that the jet will cause flooding, but we were wrong yesterday, the jet was still firmly in place. We did find a cracked distributor cable which we replaced (didn't fix the problem, but at least we could see that all 4 have spark). We are almost 100% sure it it the carb, so now we start trying to get that fixed as we will be replacing it with a Weber pretty soon but would love to get the stock carb back as turboguzzi suggested.
Checked the float needle is sealing correctly and not leaking? That's a great cause of flooding.
 

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Inside the float chamber, access via the screws retaining the carb top plate..
 

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Also be mind full of the fuel pressure..
 

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Discussion Starter · #18 ·
So, the problem was nothing to do with the carb at all, it was the wrong kind of spark plugs being used.... 2 weeks of serious frustration for being sent the wrong parts in a service kit!

Thanks everyone for your advices, much appreciated!
 

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OK, so now just out of curiosity.... So the toyota carb is not too small anymore? Asking as I have a Toyota carb as a backup for my original one, bore sizes are definitely smaller, but does it affect the driving at all?
 

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Discussion Starter · #20 ·
OK, so now just out of curiosity.... So the toyota carb is not too small anymore? Asking as I have a Toyota carb as a backup for my original one, bore sizes are definitely smaller, but does it affect the driving at all?
Yeah, carb is no longer an issue. If you do replace your carb with Toyota one, you will need to do some mods to the throttle housing if I remember correctly. The choke was also not set properly, so that was also part of the reason for not starting and running correctly, it was sitting in a closed position the whole time.
 
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