Outer Limits 4x4 Board

I've finally got around to finishing my G13bb engine conversion (into my '91 Sierra). It starts!

Now the problem is that the engine is reving too high at idle, as though the choke is always on. Anyone got any advise to offer? Is it possible that I'm missing a sensor (feed back loop)?

Cheers
-Ian-

Vacume leak

Mock

very very possible - I wasnt sure about a few things there. I'll look into it.

Timing

Pep wrote:Timing

its efi so its all controlled by the ecu...isnt it?

i would look for vacuum leaks. is the IAC hooked up correctly? clean the plug.

Spike_Sierra wrote:

Pep wrote:Timing

its efi so its all controlled by the ecu...isnt it?

i would look for vacuum leaks. is the IAC hooked up correctly? clean the plug.

But base timing is still set manually. Check all vacum lines etc, and make sure that your electrics are all good. Check coolant temp sensor incase choke is staying one due to faulty sensor reading cold start all the time.


Layto....

lay80n wrote:

Spike_Sierra wrote:

Pep wrote:Timing

its efi so its all controlled by the ecu...isnt it?

i would look for vacuum leaks. is the IAC hooked up correctly? clean the plug.

But base timing is still set manually. Check all vacum lines etc, and make sure that your electrics are all good. Check coolant temp sensor incase choke is staying one due to faulty sensor reading cold start all the time.


Layto....

Just wouldn't hurt to check if you can get your hands on a timing light,
that why mine was idling a little high,
altho mines only a carbied 13b but the theory is still the same
Pep

Thanks for the ideas.

To clarify: when the engine is rev'd, it returns to an idling speed, but immediately speeds back up to what sounds like about 2500 rpm (very approximate as there is no tacho yet).

offtopic: when you can work out how to run a tacho let me know....

To get the tacho working you will need to get hold of a jimny cluster and retro fit the tacho from there. The sierra tacho is different and from what I have found you will not be able to get it going of the jimny ecu.

im probable not the best at retro fitting anything, and ive got a drover dash so no tacho, is there a way to fit an aftermarket one, as normal aftermarket ones dont work, is there a special type.

sorry for hijack.