just got C4 and need with help LT-1 engine
Thread Starter
Heel & Toe
Joined: Jun 2008
Posts: 20
Likes: 0
just got my 1994 C4 and need some help with LT-1 engine
hi
i just bought a 1994 c4 corvette with LT-1 engine / 6mt by the way i live in Kuwait . my car have about 202000 KM on the odometer. the car run great except for some small issues hope that i can find some answers here
some of the mods on the my c4 , installed on it when i bought it unknown milage on the mods
-BBK throttle body
-LT4 heads , pistons , cams
-3inch exhaust unknown brand
-head man headers
-force air intake system
did a compression test and it showed 76%.
get on subject issues
-at lower RPM the idle start to rumble then the car just shut down other than that no problem
-brakes barely stop i bush the brake pad al the way down so the brakes will stat working ( is it pads or brake lines ??) also some times the right back break grip
-when the transmission start to get hot from several hard runs its i hear a metal sound when i get it in 1st and 2nd gear
** also i have some picture that i need to know what are these peaces for
thanks for any input in advance
i just bought a 1994 c4 corvette with LT-1 engine / 6mt by the way i live in Kuwait . my car have about 202000 KM on the odometer. the car run great except for some small issues hope that i can find some answers here
some of the mods on the my c4 , installed on it when i bought it unknown milage on the mods
-BBK throttle body
-LT4 heads , pistons , cams
-3inch exhaust unknown brand
-head man headers
-force air intake system
did a compression test and it showed 76%.
get on subject issues
-at lower RPM the idle start to rumble then the car just shut down other than that no problem
-brakes barely stop i bush the brake pad al the way down so the brakes will stat working ( is it pads or brake lines ??) also some times the right back break grip
-when the transmission start to get hot from several hard runs its i hear a metal sound when i get it in 1st and 2nd gear
** also i have some picture that i need to know what are these peaces for
thanks for any input in advance
Last edited by DON-Z06; Feb 25, 2010 at 10:17 AM.
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
1. Check codes to see if there are any engine faults showing up. As heavily modded as it is you might need to find someone that can do a custom tune.
2. Check the brake pads and do a brake fluid flush.
3. Check fluid in the trans. Maybe do a drain and refill and check for any 'debris' in the old oil.
4. Easiest way to post pictures is to set up a free photobucket account and use it to post your pictures.
Hope this helps.
2. Check the brake pads and do a brake fluid flush.
3. Check fluid in the trans. Maybe do a drain and refill and check for any 'debris' in the old oil.
4. Easiest way to post pictures is to set up a free photobucket account and use it to post your pictures.
Hope this helps.
Thread Starter
Heel & Toe
Joined: Jun 2008
Posts: 20
Likes: 0
before the engine did show some codes the i toke it to the tuner he did remove all bugs/faulty codes after that the car ran great but my problem as i stated . so, u think i should get new tune ??
do i have to change the break line or just flush the fluid also use GM fluid or is there is other brands that is recommended
sure will do and let you know guys ,keep them coming
do i have to change the break line or just flush the fluid also use GM fluid or is there is other brands that is recommended
sure will do and let you know guys ,keep them coming
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
I would want to know what codes he found and cleared. Did he fix the cause of the codes or just clear them? You might want to take it back to him and find out.
Again, check the brake pads. As hot as it gets in Kuwait I would go back with a top quality synthetic brake fluid. You said you have forced induction (supercharged or turbo charged) so you might also want to check vacuum to the brake booster. Low or no vacuum gives a very hard pedal and very little stopping. Does it have an auxillary vacuum pump? If the brake lines are not leaking they are probably not the cause, but check them for any cracking and replace them with Stainless Steel lines (Earl's or Goodridge) if in doubt.
Again, check the brake pads. As hot as it gets in Kuwait I would go back with a top quality synthetic brake fluid. You said you have forced induction (supercharged or turbo charged) so you might also want to check vacuum to the brake booster. Low or no vacuum gives a very hard pedal and very little stopping. Does it have an auxillary vacuum pump? If the brake lines are not leaking they are probably not the cause, but check them for any cracking and replace them with Stainless Steel lines (Earl's or Goodridge) if in doubt.
Thread Starter
Heel & Toe
Joined: Jun 2008
Posts: 20
Likes: 0
link of pic
http://s954.photobucket.com/albums/a...t=IMG_0036.jpg
sorry for the dirty engine bay but its really hard to keep it clean with the weather here
first of the black pipe that connected to the valve cover and throttle body is it vacuum line because is just notice its lose ?
second pic there is the pice of silver metal under the fuel line that is smashed and shut is it like this from the factory ?? what is it for ?? should b it be connected to something ??
http://s954.photobucket.com/albums/a...t=IMG_0036.jpg
sorry for the dirty engine bay but its really hard to keep it clean with the weather here
first of the black pipe that connected to the valve cover and throttle body is it vacuum line because is just notice its lose ?
second pic there is the pice of silver metal under the fuel line that is smashed and shut is it like this from the factory ?? what is it for ?? should b it be connected to something ??
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
OK. The line in the first picture is a vacuum line, second picture is a crimped off line to the manifolds as part of the emissions system. So emissions has been by-passed, which is no problem for you. Find out what codes were set, clean up that engine bay (do NOT wash the front of the engine or you can ruin the optispark and that is expensive), and get your brakes fixed, and transmission serviced. If it is a hard pedal check for any vacuum leaks, otherwise do as we discussed ealrier. Not much else I can do for you on line, but we are here to help if we can.
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Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
No problem. I am a little curious though as I am not familiar with Kuwait. Is it difficult to find shops that work on a C4 Corvette and can you get parts for it when you need them? My son is in the USAF and it looks like he will be heading to Iraq or someplace close to it in a few months. He also has a Corvette (2004 convertible) and will be missing it while he is on your side of the world for awhile.
Thread Starter
Heel & Toe
Joined: Jun 2008
Posts: 20
Likes: 0
well there are good tuners here but not as good as in united state as far as parts yes you can get them easily especially chevrolet parts but as far as corvette c4 most of the parts have to be ordered form her (usa) and it would not take long maybe a week to 2 weeks depend on back order of these parts
the good thing is the labor is close to nothing maybe 400 dollar to install SC/turbo/NOS on almost any car thats just an example. so tell your son to ship his corvette he's going have a pleasant time am sure if he's in modding cars
the good thing is the labor is close to nothing
maybe 400 dollar to install SC/turbo/NOS on almost any car thats just an example. so tell your son to ship his corvette he's going have a pleasant time am sure if he's in modding cars
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
What voltage is the gauge showing when off and when running? Check both the analog and the digital gauges. Low voltage can really screw up an LT1/4.
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 196
From: folsom california
what you have is an LT1 someone has at least partially upgraded to LT4 specs.
as to your second picture, LT1s used an EGR (exhaust gas recirculation)valve; LT4 did not need EGR, their longer duration camshafts provided "free EGR". The LT4 manifolds (red color is a dead give away) blocked off the EGR mount with a simple plate; someone cut off the tube from an EGR flange, flattened the tube, and mounted it in place of the stock LT4 block off plate.
The first picture is a tube used for the crankcase ventilation system; its not super critical but it should mount up snugly, not loosely.
as to your second picture, LT1s used an EGR (exhaust gas recirculation)valve; LT4 did not need EGR, their longer duration camshafts provided "free EGR". The LT4 manifolds (red color is a dead give away) blocked off the EGR mount with a simple plate; someone cut off the tube from an EGR flange, flattened the tube, and mounted it in place of the stock LT4 block off plate.
The first picture is a tube used for the crankcase ventilation system; its not super critical but it should mount up snugly, not loosely.
Thread Starter
Heel & Toe
Joined: Jun 2008
Posts: 20
Likes: 0
where can i buy a the hole new electrical kit for my c4 from? not just for the engine but for the hole car am not sure what its called her but that the best i can describe
also what do you recommend for pulley kit . am thinking of ATI pulley but i don't know what parts number pulley that will fit an LT engine and if there is something that is been used and proven for this platform ?
also what do you recommend for pulley kit . am thinking of ATI pulley but i don't know what parts number pulley that will fit an LT engine and if there is something that is been used and proven for this platform ?
