Samurai idle

[nomis]

I have recently bought a samurai (1300cc throttle body injection)

And it has some tuning issues....

   ...it did have a bad flat spot when accelerating, but i traced this to a timing issue, now fixed...

  ...but it also has a habit of idling really high when first started (and also at other times  :roll: ) approx 3000rpm!!  This can't be normal surely!

Adjusting the idle speed screw has no effect on this, as eventually the speed drops back down to it;s proper setting.

Also the engine will often hunt between 1000rpm and 1500rpm, very annoying!

Is there a sender unit malfunction?
Is this a tune up issue?

Any ideas?  :(

[tjsj]

Well mine used to rev very high 3000 - 4000 but it did have an automatic choke on it and there should be two screws on the carburetter with springs attached to them. If you have an auto choke then adjust that and see what happens.

[nomis]

there is no carb!

it's fuel injected, that's my problem!

i am used to technology about 20 years older than this (air cooled vw's), so electronic injection is currently a bit of a mystery to me  :roll:

[Evilgoat]

TBI Units still have the throttle body which I think is what he means.

EFI engines tend to lookat the coolant sensor to work out wether to do cold start enrichment. Does your temp guage work? Check the temp sender and watch it when it plays up. Idle adjustment wont do anything if it thinks your engine is cold. Your fuel consumption will be awful too.

2000rpm seems normal for these when cold.

[nomis]

the temp gauge seems to work, but never gets very high.

I have not yet seen it get up to halfway on the scale, maybe the problem could be here then?

[Evilgoat]

before I nadgered my rad, mine didnt. Some cars (My Audi being one) use a 2-part sensor for engine temp. I have the reverse atm, EFI is fine but temp guage is dead.

If you dig about on the net you may be abl;e to find out how to see if there are any stored fault codes in the CFI system.

Other than that without looking, I dont know.

[nomis]

i don't much like the phrase "stored fault code"!!!

as i said, i'm used to good old carbs  :roll:

Is it possible to convert the car to carbs?
What about the progressive kit that's out there somewhere?

[spy]

I am going completely from my experience of run of the mill cars here but it just might be relevant.  If you described the above and told me it was say a vectra or similar I would have said maybe cold start switch/temp sender (sometimes the same temp sensor that controls the guage, sometimes seperate) and or idle air control valve faulty or dirty (usually in the air intake pipe or near throttle body, again on average cars).

I can have a look on autodata in work tomorrow and see if I can find any suggestions for locating and testing sensors if it helps?  I really dont know if that lot is relevant to your motor or not so if im spouting drivel I apolgise in advance! :D