L83 Crossfire has miss
Thread Starter
4th Gear
Joined: Mar 2005
Posts: 4
Likes: 0
L83 Crossfire has miss
We picked up an 84 that has been sitting for 10 years. It has 26,000 miles. After cleaning the gas tank, a tune up, egr valve, it still has a miss. Any help would be appreciated
Thank you
Thank you
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Originally Posted by 427forever
We picked up an 84 that has been sitting for 10 years. It has 26,000 miles. After cleaning the gas tank, a tune up, egr valve, it still has a miss. Any help would be appreciated
Thank you
Thank you
Need a little more info.
Any codes or check engine light? Have you checked fuel pressure (should be 9-13 pounds)? Have you checked for vacuum leaks? After 10 years of sitting the lines WILL be rotten. What did the tune-up entail? Plugs, cap, rotor, wires? Connections at ignition coil / module solid and not rusted? Check all grounds and wiring connections? Both injectors spraying a misty cone shaped spray (no drops)? Fuel filter changed?
When does the miss occur? Idle, cruise, acceleration? Any particular RPM? Have you run a compression check to clear up possibility of stuck valve (any backfiring)?
This should be pretty easy to clear up....just need to do a little troubleshooting.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by 427forever
We picked up an 84 that has been sitting for 10 years. It has 26,000 miles. After cleaning the gas tank, a tune up, egr valve, it still has a miss. Any help would be appreciated
Thank you
Thank you
A lot can be learned by reading through the posts on here.
RACE ON!!!
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Pull each plug wire and measure the resistance. It should be close to 5000 ohms per foot and wiggle each end to see if the resistance is stable and not intermittent. If ok, then at night, engine idling, look for sparks to ground along each plug wire. Check for plug wires that are touching metal, the wire looms prevent this. Plug wires have microscopic pin holes in them and will arc to ground, so wires should not be touching grounded metal.
