Just installed a edelbrock high flow intake and runner with 24lb. injectors. Engine starts but will fall on it's face below 1k rpm. stalls completely and immediately! No engine codes, fuel pressure is steady at 44lbs everythings connected (i.e. vacum lines, sensores, etc.) The only way so far that make is idle - is disconnecting the MAF or removing the induction tube between the MAF and Throttle body itself. Autoxray doesn't show anything unusual except running way lean.

Any advice???

 

You have a Vaccum Leak.

YOu also will need to compensate for those 24# Lb injectors Once you get the Vac leak straitend out.


EDIT : And what the hell is a Casper TPS adaptor ?

If it is what I think it is, Get it the Hell out of there.

 

Check the little holes between the injectors one of mine were drilled to deep and was BIG vac leak.

 

Are you talking about the intake bolt holes?

By the way the Casper TPS device shows wide open tbrottle a little quicker then stock to the ECM.

I'm confident a vacum leak is the problem, just can't find or hear anything. The intake, runners and plenum were installed with great care. I did notice the new injectors did not extend into the injector holes (on the intake) nearly as deep as the stock ones. Would this be a problem?

 

see the little hole between the injector holes

 

Going down to check now, what are the holes for???

 

I am no help with your problem but am interested in knowing how the intake fit ? Curious if it is really a "bolt-in" or did you have to mess with stuff to make it fit ?

thx,
RP.

 

Ok, used starting fluid around the runners and found the vacum leak. took the runners off, resealled them and was able to hold an idle.

Idles, but really rough now with a shake up to about 1500 rpm before it smooths out and developes some horses. Also, arcing from MSD coil to coil mount (has new wires), was doing it constantly (MSD 6al connected) and now is doing it every 60 seconds or so (MSD 6al disconnected). Still no codes!

 

Regarding the edelbrock installation, i had to make a few minor bolt hole enlargements and some porting. especially on the plenum and runners, intake required minimal to get perfect alignment.

 

This happened once before on the board ... the runners are NOT interchangable right to left.

If you get them on the wrong way, a port opens up for ... something (EGR?) and causes a massive vacuum leak just like you describle.

Try switching the tubes side-for-side (yes, a PITA) and then see what happens.

Also, you have to make sure you're not picking up any false air behind the MAF, that the IAC and TPS are dead-nuts on and that you are reasonably close with static timing.

HTH