ok, We finally got the 305 in the Red 86 Iroc to fire up tonite.
First question, when it is running, it maxes out the oil pressure gauge, if i jump on it a bit, it may come down to 60 for a split second, maybe a little lower. Is this normal, We rebuilt the engine using the original bearings, whcih didn't look bad. We put a cam in it a summit Sum-k1102 which is a

Duration @.050 204 in. 214 ex. Lift .420 in.
.442 ex. with 112 lobe sep.

Now is this type of oil pressure normal for this type of car? The car never really ran when we bought it, so we don't know what it is sopposed to run. Is there anything we can check to see that we might have done wrong?

Next question. While setting the timing, We are holding it right about 750 rpm, and setting it to about 10 - 12 degrees advanced. As soon as i let off the throttle she dies, How can we get this thing to idle, what do we look for. Any suggestions?

 

not too sure on the oil pressure but as far as the idle goes, there's an idle speed adjustment screw in the throttle body that pushed against the throttle linkage, turn it in. i think it's supposed to be like 800 in park and 550 or so in drive (block the wheels and put on the ebrake if you don't have a buddy to keep the brakes on while you adjust it)

 

ok thank you so much Ukraine Train. I will go look for that right now. That will help us get the timing. Thanks again,
Now does anyone have a clue on the oil pressure?

 

You need to do more than just adjust the throttle stop on a TPI engine to set the idle right. The Idle air control motor is what controls the minimum air, not the throttle stop. Check the FAQ for setting the Idle air screw, its not complicated, and then you will be on track for having the TPI working properly. Check out setting the timing too, you have to use methods that are different than a standard carbed motor, because the computer controls advance on the TPI setup. Plenty of good info on all this in the FAQ

 

And jsut for reference, if this is a relatively stock TPI setup, you need to disconnect the EST bypass connector along the firewall before setting the base timing.

And yes, the throttle stop screw is not intended to control idle RPM. The ECM does that through the IAC and programming.

 

as far as the fuel pressure i would suspect a bad sending unit, also dont trust what the stock gauges tell you they are known to be extremely inaccurate

 

ok we have the oil problem licked, after having it running for awhile it came down to about 60. we had it idleing sounding good, but its still saying like 40 degrees of timing at about 1000rpm. I then tried turning the destributer. When i get it to about 12 and get it to stay there for awhile, the manifolds start to glow. Can the timing lite be off? Can the marks that bolt to timing cover be on wrong? We have another thread about it, but just continiuing it here.

 

Q: Why can't I seem to get a proper timing reading?

A: The computer is programmed to automatically advance the timing. You need to disconnect the brown/black striped wire next to the heater box/fan housing and then you can get a real reading. This wire is up along the firewall on the passenger side and usually is right over top of the blower motor. There will be a plug sticking out of the wiring harness loom to allow you to easily disconnect/reconnect it. Otherwise it will seem like it's advanced a great deal. Always remember to reconnect the wire when you have set the static timing!


Thats straight from the FAQ I was refering to in my previous post, and what Vader was refering to in his. The computer controls the advance on a TPI car, and if you don't disconnect it when setting the static timing, you won't get it right! Try that, glowing manifolds are NOT good.

 

Just to add some information the EST bypass connector was disconnected when we checked the timing. I posted a thread with a bit more information in it here: https://www.thirdgen.org/techbb2/sho...hreadid=180573

 

You didn't replace the oil pump with a high volume one did you?

 

It should be the stock oil pump, we never changed it. Unless the previous owners did, but I doubt it.