94 lt-1 problem please help - F-Body Online

94LT-1Z-28 · 02-26-2008, 12:42 PM

need lt-1 help for 94 z-28 please someone im at wits end with this car(runs good till it reaches temp 210deg and starts running crappy and die then its vary hard to get started till it cools down then fires right up please someone help ismell feul at the exust

when i got the car it had biown head gaskts and bad starter.after putting new stater on i pulled the thermostate and it ran great. with blone head gaskts iput new gaskets new thermostat new coil new wires new bosh plugs it had new water pump and sending unit that prev owner put on he all so said it had new crank&cam put in last year no prof on it distrib looks old non vented could thermostat have any thing to do with this?"

Rocket 442 · 02-26-2008, 12:48 PM

I deleted your other thread that was similar to this one, since this one gives more info.

Be patient, and one of the guys who know the LT1's well will help you out.

94LT-1Z-28 · 02-26-2008, 12:59 PM

thanks

joelster · 02-26-2008, 01:49 PM

It sounds like the coolant temp sensor in the front of the water pump. There is one sensor for your guage on the dash which is in the cylinder head. This displays the temp to you. The sensor in the water pump tells the computer what temp the motor is at. If it doesn't work, the computer will always think the motor is not fully warmed up and it will be excessively rich once the motor actually warms up. It will not start at all until the motor cools down. See if it may have come unplugged. If not try to drive it to a shop that can scan it for you while the motor is running. They will know right away, if it says the motor is at 140 degrees, when you know it is fully warmed up. It's under 20 bucks iirc.

94LT-1Z-28 · 02-26-2008, 05:00 PM

thanks but have new water pump and senser put new head gaskets on temp light stays on still running crappy

94LT-1Z-28 · 02-26-2008, 05:25 PM

could valve adjustment have anything to do with it (does anyone live in or around columbus ohio zip code 43232) i need help bad

kkepford · 02-28-2008, 09:17 PM

Is the radiator completely fully ? Not the over flow indicator but the radiator itself .I had a very similar problem found had a small leak in a hose and my radiator was low. After filling it car ran normal again. Not sure if that helps but good luck.

joelster · 02-29-2008, 01:25 AM

Quote:

Originally Posted by 94LT-1Z-28

could valve adjustment have anything to do with it (does anyone live in or around columbus ohio zip code 43232) i need help bad

Um..yes. If the rockers are too tight you will run into all sorts of problems. They should be tightened to 1/8th of a turn past zero lash.

94LT-1Z-28 · 02-29-2008, 09:01 AM

it has full radiator .when cold open radiator and i get antifreze comeing out like theres a lot of presure in the radiator.when hot ill open bleeder srew i get stedy stream of coolent comeing out of bleeder . i can only keep heat in the cars inside if driveing . the car runs better with out thermostat doesnt seem like it has to much presure in cooling system. some times the moter will kick back when trying to start it when hot thats how ive have broken 2 starters form jegs. wonder if water pump is circulating its new could opti cause this to hoppen

94LT-1Z-28 · 02-29-2008, 09:10 AM

i adjusted my valves while the car was running. adjusted till quit tapeing and went a quter turn more thats what the book said but that doesnt mean its right. i dont have the tools to check the valve lash .lost40,000 in tools during divorse trying to get more but car wont get me to and from plus im a dis abled vet and live on small income . im trying to do all my self.