84 running...... different

[hotshotzny]

i hexed myself the other day when i was saying to myself that my car has been running great lately!! the funny part is it isnt running "bad" just yet.. it just isnt running the same.... 2 days ago and since i made a few changes at the begining of the season it was running great... would lay rubber and sounded like it was going a lot faster than it really was!!.... tonight as i was driving through town i noticed it didnt sound just the same... doesnt sound bad, isnt missing or hesitating at all but when i gave it shot it just kinda rolled foward... didnt have that kick it had before.... im almost thinkind i may have gotten bad fuel but i cant be sure just yet.... like i said it isnt hesitatitng or back fireing, its not stumbleing.. its just not the same... im a little confused as to where to start looking at this point...... the only other thing that i should mention is thatit has been really really wet..... and when it isnt raising the humidity has been un bearable.... and tonight was no differnt.. no rain but really humid

 

[vetteboy86]

I can't speak for how your car runs, but I will say that weather does have an impact. We have had a cool summer, the cars probably love it. If you got a does of hot humid weather, sure you may notice a difference. Once again, obviously it is a seat of the pants change, so how many hp would that be??

If you have not changed anything, give it a little time. Don't go fixing anything if you think it isn't broken. Now if this continues start looking towards the easy stuff first. Fuel filter, basic ignition components.

 

[hotshotzny]

removed the cat, muffler eliminators....no major work, no modifications to the engine..... you probably wouldnt notice the change if you never drove the car... feels like any other crossfire....... was thinking about checking the fuel filter for laughs... ive gotten so good at that i can do it without putting the car on the lift

 

[vetteboy86]

That's just it. As corvette owners, we notice subtle differences in our cars. It could be something related to humidity. Doesn't amount to much, but just enough to trigger a question.

 

[Schrade]

Raise the hood on a warm motor, COMPLETELY dark, get a water sprayer/mister, and shoot the spark plug wires. Watch for the aurora borealis light show. That pretty much all that wet weather will do, is let current discharge through the wires.

After that? Air, fuel, fire. Air filter, fuel pressure, wires/plugs/timing. If you want it tuned right, ya' gotta' know these numbers.

 

[CorvetteArchives]

Raise the hood on a warm motor, COMPLETELY dark, get a water sprayer/mister, and shoot the spark plug wires. Watch for the aurora borealis light show. That pretty much all that wet weather will do, is let current discharge through the wires.

After that? Air, fuel, fire. Air filter, fuel pressure, wires/plugs/timing. If you want it tuned right, ya' gotta' know these numbers.

Wet weather like rain? Probably right ...but humidity is a TOTALLY different animal! Keep in mind on an 84 the system isnt "sealed" like a TPI. Condensation in fuel tank and lines could be a big problem on ANY car. Heck, on a CFI it could be dripping water into the fuel mix right at the injectors! I use stabil all year long as a defense....my 50 yr old garage suffers from condensation problems due to poor ventilation.... in rapid temp changes condensation is very VISIBLE. (gotta fix that one of these days!)

My car was originally a shore car and the salt air and condensation reeked havoc on many connectors. I now have a decent coat of dialectic grease on every connection and the car runs consistantly well. If you dont have that coating the humidity CAN affect the connectors and cause some problems!

 

[tonyponykay]

84? Run for the hills! or get a L98

84! Run! :W:W

I have heard horror stories about that crossfire, friend of mine had one in Nevada and it never ran right. He finally had to sell it for a pitance. I feel for you.

Don't know anything much about crossfire other than it's got a lot of issues.

Personally, I'd do what another vette guy I know did, yank that engine out and put in a 383 stroker. There may be a few problems you'd have to tinker with for a bit, but a lot less than a crossfire.

Good luck whatever you do.

tk:bash

 

[93Rubie]

Personally, I notice my 93 likes it cool outside like in the upper to mid sixties runs real good. Doesn't like hot humid 90 degree stuff so much.

 

[JohnGrawcock]

84! Run! :W:W

I have heard horror stories about that crossfire, friend of mine had one in Nevada and it never ran right. He finally had to sell it for a pitance. I feel for you.

Don't know anything much about crossfire other than it's got a lot of issues.

Personally, I'd do what another vette guy I know did, yank that engine out and put in a 383 stroker. There may be a few problems you'd have to tinker with for a bit, but a lot less than a crossfire.

Good luck whatever you do.

tk:bash

Why bad mouth something you admit to know nothing about? It's really just the same TBI setup used on trucks for years. Dependable and easier to work on than most EFI systems. I've got two working just fine.

 

[tonyponykay]

wasn't badmouthing anybody or anything

84 is notorious,, thats just the fact.

if you are offended by that, that's your personal problem,

not mine.

I'm not badmouthing anything, I love all corvettes..

I've known people with 84s, I have had friends who bought 84s..

yours runs good, that's great for you, I hope it continues to run great forever...

calm down, good luck

pick a fight with somebody else..

tk

 

[Rob]

The '84 CrossFire system, is more difficult to keep tuned properly, but not an impossibility. Although completely different, when it comes to properly tuning them and keeping them tuned, they're almost like the old tri-carbs from the 1960s.

It was a bear to keep those three carbs tuned, and to tune them properly, but if you could master it, they were quite potent for their day.

 

[vetteboy86]

I think it is safe to say we can all agree to disagree here from time to time. Everyone sees a little something different in each corvette they look at. Some say that the TPI isn't worth much because it doesn't make enough peak HP, while others praise it because of the low end torque. The 84 did many things good, but like any other year corvette, had issues their owners find, and share.

 

[CorvetteArchives]

The '84 CrossFire system, is more difficult to keep tuned properly, but not an impossibility. Although completely different, when it comes to properly tuning them and keeping them tuned, they're almost like the old tri-carbs from the 1960s.

It was a bear to keep those three carbs tuned, and to tune them properly, but if you could master it, they were quite potent for their day.

I think that this is even a common misconception that they require frequent effort to tune like the old carbs.
I've NEVER had to even adjust the CFI itself in 17 years. A couple new IAC valves a decade ago and that was it. I suspect that people monkeyed with CFI to try to increase performance and end up doing more harm than good....CAUSING an imbalance that someone then has to fix.
It may even be that when some other component is causing trouble the CFI gets blamed. For instance, my fuel pump was weak and the car didnt run as well as it had in the past. Someone might assume it was a fuel problem related to CFI. Replaced the pump and a huge difference.

 

[CorvetteArchives]

84! Run! :W:W

I have heard horror stories about that crossfire, friend of mine had one in Nevada and it never ran right. He finally had to sell it for a pitance. I feel for you.

Don't know anything much about crossfire other than it's got a lot of issues.

Personally, I'd do what another vette guy I know did, yank that engine out and put in a 383 stroker. There may be a few problems you'd have to tinker with for a bit, but a lot less than a crossfire.

Good luck whatever you do.

tk:bash

Hmm...when you ripped out the perfectly good 350 would you then put the CFI back in hooked up to the 383? That would solve ANY reliability issues?
Any educated person would recommend a TPI "upgrade" for added performance and reliability to a CFI with problems they couldnt solve...dont see what displacement has to do with reliability issues
Please explain if you can;help

 

[gmjunkie]

It was a bear to keep those three carbs tuned, and to tune them properly, but if you could master it, they were quite potent for their day.

Naw,Ain't bad if you understand them!!
Ol Girl don't get driven but a couple times a year,But she'll still put a hurt'n on a Rustang!!

 

[JohnGrawcock]

I think that this is even a common misconception that they require frequent effort to tune like the old carbs.
I've NEVER had to even adjust the CFI itself in 17 years. A couple new IAC valves a decade ago and that was it. I suspect that people monkeyed with CFI to try to increase performance and end up doing more harm than good....CAUSING an imbalance that someone then has to fix.
It may even be that when some other component is causing trouble the CFI gets blamed. For instance, my fuel pump was weak and the car didnt run as well as it had in the past. Someone might assume it was a fuel problem related to CFI. Replaced the pump and a huge difference.

I'd have to second that. In fact all the adjustment points were locked down at the factory to keep you from messing with them. Usually no need to synchronize unless your fixing a worn bushing in the linkage or throttle shaft.

 

[JohnGrawcock]

Naw,Ain't bad if you understand them!!
Ol Girl don't get driven but a couple times a year,But she'll still put a hurt'n on a Rustang!!

Nice goat