Gremlin just infested my LT-1
Thread Starter
Teching In
Joined: Jul 2018
Posts: 1
Likes: 0
Gremlin just infested my LT-1 Now that I am just about to drive it cross-country for a new job and new life, my totally stock '95 Formula develops its first big problem. It has been spending a lot of down time the past few years since I was working out of state and driving my other car, but it has still been running great, smooth, and clean when I take it out. But today the LT-1 seemed a little rough idling, and running surprising rich -- unburned gas smell -- and although it seems to run strong and seemingly on all cylinders when I floor it, it now cranks but does not start unless I put it to the floor --- that's right, like a gas-flooded carburetored car. Also a strong gas odor persisted after I shut it down at home, and it seems to occasionally be alternately running cool and then a bit hot since I flushed the cooling system last month (maybe air in system?). I don't have a clue what this new gremlin could be --- injector, EGR, O2 sensor, optispark, etc. but I need to fix ASAP. Any help you can provide would be greatly appreciated. Thanks up front for suggestions.
Last edited by Plum Formula; Jul 31, 2018 at 06:25 AM. Reason: clarity
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
You also may have fouled injectors from old fuel spooge in them.. I'd try the above with a healthy shot of seafoam in the fuel and a Italian tune up...
Also if your that rich you may have washed the cylinder walls down and a shot of oil in each cylinder then spin it over with the plugs out... Then fresh plugs.
If it got parked with ETH fuel,, its hard on rubber bits..
Also if your that rich you may have washed the cylinder walls down and a shot of oil in each cylinder then spin it over with the plugs out... Then fresh plugs.
If it got parked with ETH fuel,, its hard on rubber bits..
Cranking but only starting when floored, my guess is you have a leak somewhere. If your not seeing any fuel on the ground check the, Injectors, regulator, pump itself.
Have you checked fuel pressure, and how long it maintains it?
Mike
Have you checked fuel pressure, and how long it maintains it?
Mike
the whole running rich and idling rough thing has me questioning one of your sensors. even if you have a leaky injector the O2's should compensate for the extra fuel and lean out the mixture. I would check your MAF first. pull the PCM fuse for 20 minutes to reset the PCM then unplug the MAF and see if anything has changed when you drive. a junky MAF will cause hard start scenarios too. I don't think anything is wrong with your ignition system or fuel pump. Also it makes sense that the car would run fine at WOT because the PCM is commanding fuel to be dumped in anyway. if unplugging the MAF fixes it, then use MAF cleaner on it. does the car run rich in both open and closed loop? if it runs fine in open loop but not closed loop that narrows the issue down to the O2's. any trouble codes? are you able to check the spark plugs to see if any are fouled?
Trending Topics
Teching In
Joined: Aug 2017
Posts: 24
Likes: 0
From: Lansing, MI
My TPI had the same symptoms... found a leak at the fuel rail. The gas I was smelling was coming from under the hood. Car ran very hot due to lean condition, but I could smell gas.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo