Idle concerns

[Jim Nolan]

With the cams reset after full porting will there be a lope in idle? The RPM is about 900. The second issue is when I get on it there seems to be little difference with key on or off, RC injectors installed 2 years ago. I am debating wether to pull the plenum off and check the secondary advance. I put a vacuum gage on with engine running and it holds about 23 hg. SW headers also. Any thoughts.

[jonszr1]

i dont think you should have any lope , my callaway car has the cam timing redone and its smooth. by advance you do mean the opening of the secondary vac system???/when you turn the car on does the pump go on and then stop ?what year is your car????if its a 91-95 do you have the prom changed so the valet key is allways on ???.you might ck the fuse for your sec system its on the drivers side wheel well if its a 90 . sounds like your valet key is either turned off , switch is bad or fuse is out. other chime in ,but thats what little i know hope it helps

[Jim Nolan]

The e-prom has been reflashed but not for constant key on. I can go key on during hard acceleration and feel a little more power but not much. I was wondering if the secondaries on one side were not working would it just be a lack of power or a noticable miss or what. At idle it may look like a lope or a miss but no miss is noticed at full throttle. The pump does go on then off. It's a '92

[Jeffvette]

Jim, when you say lope, is the whole car shaking? Or can you just hear the lope in the exhaust?

[Jim Nolan]

The engine has a has a slight even shake that reminds me of my old '66 327/350.

[Jeffvette]

Sounds like a miss. Check spark.

[Kb7tif]

Let it warm up real good Listen to your tailpipes for a miss.. Both sides should be close.

[ZR1ROB]

you should feel a little lurch around 3K. if not, your secondary system isnt coming on. maybe the key circuit - a tech1 will tell you that. The green light is controlled by the ECM so if you see it, then the key circuit is working - the tech1 really isnt necessary for that. spark was mentioned, check your plugs - make sure they are torqued to spec - 20Nm. and make sure the plug wires are connected securely. It could be your secondary fuel pump is bad, or the relay for the secondary injectors is bad, or a wire is cut. Any codes? check your fuel pump fuses - there are two. and check the injector fuses, 2 too! sooty black exhaust? again, maybe a bad plug or wire.

[Demps]

Jim,
Come over to Ft Walton and we'll check it out.
Ted

[Jim Nolan]

Where at in Ft. Walton. I'm pretty familiar with the area as I lived there for 20 years.

[Jim Nolan]

I bought a set of plugs with the intent of changing them regardless of their condition. The car had been set up by a tuner after full heads up porting. What I found was all the plugs looked as plugs should look with 500 miles on them. The disappointing part was the passenger side was gapped to .042 and the drivers side had plugs 1,3 and 7 gapped to .035 and plug 5 gapped at .030. The passenger side took some effort to break them loose but the drivers side no effort at all. This tells me two people were working it at the same time. It runs much better now.

The car was dynoed with the plugs like this. Would this have effected the dyno numbers. Based on what I read I was expecting 410-420 RWHP but came up with 397 RWHP or was I being too optimistic.

[jonszr1]

by full porting do you mean heads ,inj housings and plenum/ who did the porting and assembled the motor ? i have a callaway 475 s nat thats supposed to be fully ported and the hp dymo numbers are 396 . i also have a 90 that has only the inj housings and plenum ported and the hp on that car was 409.9. so i can depend on how it was ported . more info would help on finding out if you are getting what you should be getting

[Jim Nolan]

May be I should rephrase this. I wasn't complaining about the engine builder or the numbers. I was just curious to know if the plug gaps as stated earlier would have affected the dyno numbers.

It was a porting of heads, injector housings and plenum. I also added headers with no cats.