HELP !!! FERRARI 348 HIGH IDLE

And in lower case:


hello people can anyone please help me i have an idle problem with my 89 348tb i cant get it to keep a low idle i have high flow cats and custom exhaust

i just changed the o2 sens. new k&n air filter my air sensors are right at 383 like the book says i took off the throttle bods and cleaned them and the air fuel adj screws and set them to 1 1/2 turns out checked the vac. lines they look good and have new plugs and the wires looked good old plugs were perfict light tan color all oil and coolent temps are where they should be oil press. is great i took out the screens on the air flow sens. and tried to adj the idle every way possible but its at 1300 -1500 it rises and falls aprox 100 rpm at times i was told it had a belt serv aprox 4 years ago it really does run mint and shifts mint but for the life of me i cant get the idle to 1000 rpm when i got the car the air fuel adj screws wer out 2 3/4 on the pass side and the air sens. was set to 940 on the drivers side the air fuel adj was out 2 1/2 turns and the air flow was at 550 any ideas or fix anyone can help me out with i know its belt serv time but its just running so good right now i hate to tie it up just yet but i will soon changed the lubes oh and one more thing my clutch grabs high is that normal ?? i dont see or feel any slipping and the car has great power and tourque where do the clutches normly grab high or low ?? thanks guys tommy gun

 

Hi there. Have you cleaned out the Idle Control Valves? Located forward of the MAFs. I was having idle problems, hit 4000 rpm once on idle. Cleaned out the ICVs with MAF cleaner and it sorted it.

 

You look like you know what you're doing but just in case, it's part number 13 on this diagram.

Edit: turns out I didn't know what I was doing. Is attached now (hopefully)
Image Unavailable, Please Login

 

Wow, a Giallo TB... stunning.

Hope you get the idle sorted soon.

All the best,
Andrew.

PS:
Also, your wheels are on backwards.

 

I wouldn't be surprised if your left and right throttle butterflies are way out of synch, especially if someone has been messing with the balancing screw on the linkage, in a misguided attempt to adjust the idle speed that way. If you have a shop manual, look at figure 55 on page C87. In general terms, the linkage for each butterfly should be against its stop screw (#2) when the throttle is at idle. Once screw #4 is set so that the butterflies are in synch, it shouldn't ever need to be adjusted again.

Good luck getting it right ASAP!

 

Excellent. Happy motoring Tommy.

All the best,
Andrew.

 

You fixed it yourself / for free / with just a screwdriver? That's what I like to hear!

If the throttles are set up even close to correctly, the Motronics should take care of the idle speed. There isn't an actual "idle speed screw" anywhere on the linkage.

Good thing you changed those wheels, or someone would have complained that your stock wheels were mounted on the wrong sides of the car...

 

At least two of us already did, but only one had the 'class' to do it via PM



Just teasing, Andrew

 

Well, I've always presented myself as enthusiastic rather than classy.

All the best,
Andrew.

 

Lol.

And I've never been accused of being subtle.

 

Is that a subtle way of declaring that you're, on occasion, indelicately mirthful?

Vivaciously,
Andrew.

 

You're starting to use long words now, which is just unfair! But yes, can't help it sometimes

 

Someone stole your fuel cap