Primera Auto Choke Problems?

[Grandaddy_Low]

Helllo All,

I have a 1600 '93 Nissan Primera. I'm not sure what name it was realeased in the U.S. as but I think it is a Primera in Japan also.

Recently it has developed a very fast idle. It runs normally when cold, then very bad while warming up (sometimes stalling and refusing to re-start) then idleing very fast whilst warm. Initially it exitbited this problem intermittantly, but now all the time. Before the problem happened all the time, it would suddenly run normal and then suddenly not which would seem to indicate an electrical problem of some kind (?). It is normally aspirated and I suspect that it may have something to do with the auto-choke.

To date I have:- - replaced the plugs (and regapped them) - replaced the air filter - replaced the dizzy cap and rotor arm - checked that the hot/cold air regulator works - checked that there are no leeks in the vacuum hoses - disconnected the wiring to the carb and applied 12v accross the various solanoid terminals on the carb to check that they are clicking in and out properly.

I can't get into the auto-choke because it has tamper proof screws (think that might be some regulation in the UK to stop ppl messing up their emmissions). Has anyone any ideas what I might try looking at next? There is a wire that runs away from the auto choke which is soldered on - does anyone know what this is for?

Thanks for you help,Cheers, G.

[PalmerWMD]

G:

It's an Infiniti G20 in the US.

So I will move your post to the Infinti Online mechanic for better response.

Fred...

[maxnix]

Might check stoneage_tech posts, or email him, as he had a G20. In the USA, all Gs were the 2L engine. No 1600 unless they were in other Nissans.

[Grandaddy_Low]

Thanx for movin it Seems to be a bunch of cars which get re-badged when the hit the UK...

G.

[Grandaddy_Low]

Problem solved. Dumped a vast quantity of carb cleaner down it then drove it for a couple of miles. Seems to have solved the problem completely... shuda tried that first

Cheers, G.

[PalmerWMD]

Good!

Glad it worked out.Sorry we coudln't solve your problem quickly but often we do.And thank you for lettign us know how it worked out.

Fred...

[EZcheese15]

Grandaddy, just curious what motor is in your car. I mean what is the engine code? Like maxnix said, it's the G20 in the U.S. but all G20's only have the SR20DE engine (2.0L). Curious what you got?

SR16DE? GA16DE?

[Grandaddy_Low]

EZCheese,

Not managed to work out what engine is in it specifically. Would it be shown on the VIN plate? In the UK the Primera was released with a 1600, 1800 or 2000CC engine. As far as I know all the engines were fuel injected on multi-point fuel injected with the exception of 1600's made before June '93. Mine is twin camed so I assume the rest are as well. Can post a photo at some point if it'd help...

Unfortunatly, shortly after my last post it started playing up again. I have shoved more carb cleaner down just as I did before but with no success. Think its time to buy a scrap carb and shove that on it.

Cheers, G.

[EZcheese15]

Yeah, a picture would most definately help. Also, if you look under the hood, there should be some type of plate that has the engine specifications on it. Should say how many CC's the engine is, as well as it's engine code.

If your car is a twin cam, fuel injected motor, it will be XX16DE. XX will be a two letter code telling you what engine family it comes from. 16 is for 1.6L, D is for DOHC, and E is for electronic multiport fuel injection. I would guess it is going to be an SR or GA engine, but don't know for sure.

[maxnix]

Quote »Think its time to buy a scrap carb and shove that on it. (sic)[/quote] Not if it's a xx16DE engine!

[Grandaddy_Low]

Its definatly not an 'XX16XE' and I doubt that its a 'XX16DX' either- just a bog standard normally aspirated 4 pot. I'll try and like to some pics 2nite (or this morning depending on which you reside...).

Daft question, but whats a 'MAF'? I've seen referance to them but havn't quite managed to work out what it is yet - I can't find any referance in it in my Haynes manual... Once I know what it is, I'll go clean it

Thanx for your help ppl - it is appreciated!

G.

[EZcheese15]

Its definatly not an 'XX16XE' and I doubt that its a 'XX16DX' either- just a bog standard normally aspirated 4 pot. I'll try and like to some pics 2nite (or this morning depending on which you reside...).

Daft question, but whats a 'MAF'? I've seen referance to them but havn't quite managed to work out what it is yet - I can't find any referance in it in my Haynes manual... Once I know what it is, I'll go clean it

Thanx for your help ppl - it is appreciated!

G.

Mass Air Flow sensor

[Grandaddy_Low]

Thanx.

Pretty sure that there is nothing that scientific on mine

I couldn't get any pics (camera is at home u c), but I did have a look at the VIN plate over lunch. I looked everwhere for the XX16XX number that EZcheese suggested but I can't see it anywhere - could it be that UK cars don't have this (it was assembled in the UK).

However I did find a:Type: FAAP10 andModel: FAYARDFP10SBAH7414

But I reckon that both of these refer to the body more than the engine...

Are we completely sure that we are talking about the same car - I don't remember seeing any last time I was in the US although I did see a few of the Primera's predisessor (called a 'Bluebird' in the UK).

Cheers, G.

[Q451990]

I'd definately like to see pictures when you get the camera! This'll be interesting talking about carburators instead of injectors for a change!

Heath

[Grandaddy_Low]

Hello Again,

Well, I looked up the Haynes Manual and it does list an engine type namely a GA16D (sorry EZcheese - thought the D something else). But definatly not a DE.

Anyway, I have managed to get a photo of the engine too. Unfortuatly is was dark and very very wet (a feature of the UK). I will try and get a shot of the carb tommorow, but I thought that this would probably involve loosing important bits given the weather if I tried it 2nite...

http://www.blindingyouprawn.de...y.htm

The manual says that the catalyst version (ie mine) has a carb 'similar' to the non-catalyst version. Its carb is described as a "Nikki 21 L series carbuettor (down-draught progressive twin-venturi, with vacuum-controlled secondary throttle)". This does not mean a great deal to me, but from what I can see there is an auto-choke assemble on the side at the top of the choke. This controlls a butterfly flap accross the top of one of the bores. I reckon that under normal running (once warm) the flap should be open and from what I can see it is not fully open.

I have been dousing the carb with carb cleaner over the last few days and it sometimes makes a difference but not very often. Anyway, enuf from me - any suggestions at all are welcome. Does anybody know for definate if it has a MAF or not? I can't see anything which looks like one or find any referance in the manual to it...

Once again, thats for your help.G.

[Q451990]

I don't see a MAF in the picture, but that's no sign it's not there. Follow the air intake hose backward from where it bolts on to the carb and air filter box. If you find something with an electrical connection (usually three pins) and it's inline with the main breather hose, it's probably the MAF.

Heath

[EZcheese15]

I don't see a MAF in the picture, but that's no sign it's not there. Follow the air intake hose backward from where it bolts on to the carb and air filter box. If you find something with an electrical connection (usually three pins) and it's inline with the main breather hose, it's probably the MAF.

Heath

Um....he's not going to have a MAF sensor if it's carbourated.

[EZcheese15]

Thanx.

Pretty sure that there is nothing that scientific on mine

I couldn't get any pics (camera is at home u c), but I did have a look at the VIN plate over lunch. I looked everwhere for the XX16XX number that EZcheese suggested but I can't see it anywhere - could it be that UK cars don't have this (it was assembled in the UK).

However I did find a:Type: FAAP10 andModel: FAYARDFP10SBAH7414

But I reckon that both of these refer to the body more than the engine...

Are we completely sure that we are talking about the same car - I don't remember seeing any last time I was in the US although I did see a few of the Primera's predisessor (called a 'Bluebird' in the UK).

Cheers, G.

Yeah, we are talking about the same car. FAAP10 is the chassis design. The P10 was sold in the U.S. as a "G20" with only the SR20DE engine available.

Also, GA16DE was a good guess on my part. GA16D would be the same engine, but carbourated instead of fuel injected. (GA block, 1.6 L, DOHC)

And one more thing, are you sure it's the GA16D and not GA16Di? The "i" is for throttle body fuel injection. I can't tell from the pic if it's an actual carb or a throttle body fuel injection. The GA16D was never sold in the U.S., so I'm unfamiliar with it. But the GA16Di was sold here (in the U.S.).

[Grandaddy_Low]

If *looks* to me like a standard carb and there is no referance to injection nozzels in the manual for that motor - how would I tell conclusivly? Do throttle body fuel injection engines have chokes as such...?

I am still dumping carb cleaner down it. For the next journey or two after it seems to run OK. But this morning after it was allowed to cool all nite it was running like a dog and packed in in the middle of a busy set of traffic lights...

Cheers, G.

[maxnix]

Quote »I am still dumping carb cleaner down it.[/quote] I think you need to experience the pleasures of a carburetor overhaul. You have probably succeeded in washing all the crud further down the intake path, at best.

[Grandaddy_Low]

I was starting to fear that that may be the case. Given the hastle involved with that I think I may shove a scrap one on it. They are going for about £50 over here. Mine is a little odd as it is one of the 1st catalyst models. Even if the 'new' carb ain't great it will do while I overhall the old one as the car is very heavily used and can't really be out of action for that long...

BTW - definatly not got a MAF sensor...

Well unless anybody has any more ideas, thank you all for your expertese - I'm out of the country for a few days so won't be able to touch it for a couple of weeks. I am certainly a lot wiser about the history of my car! I would be quite interested to see you version of a Primera (G20) if anybody can link us to one...

Once again thanx for your help - I'll let you know how I get on with the new carb

G.

[EZcheese15]

For pictures of U.S. P10's, go to http://www.g20.net/rr_main.html

Then scroll down to "P10's". P11's are the newer body style.

[Grandaddy_Low]

Hello again,

Well finally it works! Took it to a guy who specialises in breaking insurance writeoffs. Initially they couldn't find a replacement carb so attempted to repair the problem by using a Nissan Sunny (Pulsar in the US?) auto choke instead. This didn't work (incompatable) so they eventually found a whole new carb and stuck that on. He spent a wee while messing with the mixture, timing and idle to get it running just right.

Its much better and using much less fuel. But under light load, at about 2000rpm it tends to stutter just a little. Is this likely to be the mixture being slightly to lean? If its more complicated than that, I can live with it for 60 GPB

Thanks guys,G.