So my 84 seems to have a dead spot in the throttle, it seems to break up at full blast...but if you lift off to like 90-95% it seems to come alive and pull harder. I checked the fuel pressure between the throttle bodies and we have a good 15PSI, timing is at 8 degress BTDC and the tune up is fresh.

So...I'm THINKING that the TPS is not set right?? The sensor looks new and I see that it has some adjustment in its angle.

Thanks for reading.

 

Sounds like your TPS sensor has a dead spot maybe, have you checked it for that? Rotate the lever on the sensor with a meter and see if there is a smooth transition of voltage all the way to WOT and also see if there is a spot that goes open as you rotate. If so, the sensor is bad. Set the new one if you replace it at .525v. Kind of curious why you have your fuel pressure so high at 15psi? Is you motor stock or have you modified the motor with a much bigger cam, heads etc...? 13psi is all you really need for a stock motor to run well.

 

So. .525v at WOT?? Just wanna make sure I understand!

And yes, the engine has different heads, cam, exhaust. We arrived at 15 PSI by reading the plugs. At 13 a bit white....now nice and brown.

 

OK, sorry. I meant .525v at idle blade setting. Key ON, Engine OFF at idle. This is the perfect setting for CFI. Try and get it as close as possible to that setting. The value WILL change as you tighten down the screws, so just keep adjusting it as you tighten it down. FYI, ANY time you make ANY adjustment on the TBs ie... Balance them or some other adjustment, you MUST check the TPS to ensure that it is at .525v.

The reason I asked about your motor is that 15 is usually too high for a stock motor, but since it is NOT stock, 15 probably works OK. What ECM are you using, what heads and what cam and lastly what intake? Curious, and have to put it on a dyno with what results?

 

Thanks for the into, I figured that was my issue since it comes alive if you lift JUST a bit. By the way I have read a lot of your posts on here and I have learned a lot about the mysteries of the crossfire thanks to you. I race my Corvette so I'm gonna have to be a bit tight lipped about the dyno numbers (wink wink) but I'm also planning on changing a few things this winter to rustle up some more horses, so it might be a moot point come this summer. This is what I can tell you though:

Stock ECM: is a chip worth anything in these cars?? Or should I just junk it and get something smarter?
Stock intake....kinda I had a buddy port it out for some more flow, Ive been eyeballing the renegade intake, but most of my team mates want me to drop a 650 Holley on it and call it done. Thoughts??
Cam: Edelbrock Part # 3702 Performer-Plus camshaft with crane 1.6 roller rockers
Heads: Chevy Vortec heads. How did I manage that?? little magic and a little carbide ;-)

 

Thank you for the compliment and hope that your CF is running well. If you want to call me and talk about your setup, that is OK as well and I will PM you the business number.

A stock ECM will only go so far and not a fan of chips since the 82 ECM was never completely hacked like the 84 was. You will have to replace it if you want more power so you can dial it in better. The BEST thing going IMO is from Dynamic EFI and moving to the EBL Flash II ECM and HAM board from me. It is by far the best thing going unless you want to move to something like a Haltech and then you would have state of the art control, but you WILL have to re-pin your entire harness, hope you get it right and replace the connectors, that would be up to you. If I ever decide to replace my current EBL which works fine, I will switch over to Haltech next.

On the intake, since there are no Renegades available that I know of, porting does work, but just be careful not to bust through into the water jacket, those walls are not that thick, but we did make the Renegade with a bit thicker walls for just that task. Ahhh...Vortec heads, there's a fine subject to talk about maybe for another time. Will it work, yes. Do I recommend it to anyone, no. You can make it work, but it is a lot of work and a bit dicey IMO. We did that project more than a decade ago and it did work, but I didn't trust it at all and soon was removed. I would have just went to something else like a 175/180 head and just bolt it on. A Vortec head is a good head though.