I have an 91 rs 305 auto...an it seems to idle too high....its throttle body also so whats the normal idle for these cars? bcz it seems like my timming might be set up by the previous owner but it idles too high an pulls on its own

 

A typical idle (when in drive) would be somewhere between 650 and 750 I believe. I have my 350 set up to idle at about 675 in drive.

Is it staying in fast idle after warming up or something?

 

yea I can start it up an it idles real high it comes down to bout 1000 or over when in drive its at 1000 it never gets below 1000 which makes me believe the timin has been messed with by the previous owner

 

I would be more willing to bet you need to replace the TBI base gasket.

 

u think so? wut makes u think that?

 

A vacuum leak could be possible so PO raised the idle speed to compensate.

best thing to do is rule out any vacuum leaks, make sure the IAC motor is OK, then reset the idle speed
to specs.

of course you can check base timing... unplug the tan wire from the dist. and then set base timing to "0" or you can set it advanced a couple of degrees.

 

It use to have a vacuum leak under the dash for the heater but other than that I don't think it has a vacuum leak now an how do u reset the idle speed?

 

ummm ahhh with the idle speed screw ? is this a trick question?

 

I had to buy a Innova digital timing gun # 3568 with RPM display to properly set timing and min. idle speed using the correct IAC motor reset procedure to finally get it right.

=https://www.thirdgen.org/tpimod2


I found mine on line for $65.00
I already have the standard timing light but is worthless compared to the upgrade.

= http://www.oreillyauto.com/site/c/de...&keyword=+3568

 

i have read that u cant just change the idle without having to go through a whole procedure...sorry if im behind ive never had or tried to set the idle on a throttle body engine its always been carb ive set em on

 

What I mentioned above is the procedure.
The digital timing gun allows you to adjust exactly to "0"*stock timing setting and then go through the IACV reset and then adjust the min. idle speed .

You can’t adjust something you can’t see like the RPMs. That's why I bought the new timing gun.

Not only is it more accurate when setting your timing but shows exactly where the rpm are.=

 

How do I set the timing is there a thread on here about it? Can someone post a link to it or tell me how to.... An where is the aldl connector so I can set my iac valve?

 

The previous owner could have advanced the base timing a little. As you turn the distributor advancing the base timing the RPMs will increase. If that's the case all you have to do is back it down to the stock setting of "0"
Is there a reason you want to reset the IACV ?

There is a thread concerning setting timing but I cant seem to find it.

 

yea when my car is warmed up an I put it in drive it idles about 1000 in park almost at 1500 I kno my tach is a lil off also but that's the reason why im thinkin I might need to reset it