20 Most Recent 1990 Chevrolet Corvette - Page 7 Questions & Answers

GROUNDS LOCATED NEAR OR ON THERMOSTAT HOUSING.ON THE INTAKE MANIFOLD.LOOK AT THE REAR OF EITHER HEAD.

yes put mixed coolant in, always.

horn button only grounds it,
put 12 volts to the horn it self see if it works,
if it does then check for horn relay

whack the bottom of the fuel tank with a sturdy broom handle or shovel handle, while someone cranks the engine. if this dosent knock the fuel pump free you will have to drop tank and replace fuel pump.

i have a 1990 vette doing the exact same thing. i have checked; fuel pressure, replaced fuel filter, checked spark, checked engine vacuum and i still cant seem to get the car to run once it's up to temp. any help on this would be great.

check the squirters in the carborater, there is a mechanical valve that squirts the gas into the butterflies, if the valves are bad then they will need to replaced hope this helps

what does it do when and after starting?

i had almost the same problem i changed my fuel pump and fuel filter and it worked u mite try that first.

try replacing your idler moter and check the timing as far as your head lamps you could be having a bad connection causing your fuel pump to shut off when you turn off your light

You're probably ready for some engine internal maintenance Timing chain, valves leaking, you know. Almost 300000 miles, Wow

about 14.if it is completely empty including the torque converter.if you drain and fill,measure it in a container and add the same amount.that should be about 5 litres

With that kind of symptoms you should be displaying a check engine light have the codes extracted and get back to me let me know what codes and I will give you a better idea of what is wrong with your vehicle.

Hello there:

Casting dates are usually expressed this way, “C 18 4.” In this example, the “C” means the month of
March, “18” is the day of the month, and “4” is the last digit of the year. This last digit may mean ’64, ’
74, ’84 or ’94, so you must also check the other characteristics of the block to determine in which
decade and year it was made. Some parts have the decade and year cast on them; these identifiers
look like this: “C 18 84.” GM introduced new model years in September or October of each year, so
when you see a casting date of “L 16 7” for example, this indicates a casting date used in the 1968
model year because it translates into December 16, 1967. A 1968 model Camaro assembled on
January 6, 1968, might contain a number of parts that were cast in December, 1967. Casting dates
should precede hand-stamped engine assembly dates.

The two most common causes of this on your vehicle is the crank position sensor and/or the fuel injection unit. It is very common for this fuel injection unit to become clogged internally and cause instances when the vehicle will stall or hesitate. ' If the cleaning solves the problem then it should only be about $80. If for any reason the injection unit needs to be replaced this is usually about $500. As for the crank sensor this can cost about $150-200.

hELLO THERE:
I would first get the fuel filter changed and see what this does
also you may have to get rid of this tank of fuel if the ratio is too bad from the sta bil
you may also want to change the plugs and have the injection system cleaned if this applies if not get some carb cleaner and clean it really good ok and this should get you going like it should
hope this is very helpful for you
best regards michael

Check your vacuum hoses and then see if the idle screw is set properly and timimg is correct and all clinders are firing properly and in the correct order. Also did this just start or was something changed to make it start??

350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4

Spark plug wire connection towards the Front of the engine;
6-1-5-8

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.

i have a 1986 chevy corvette, when you fist start the motor it idel fine, when it wormes up, it ideling rough and RPM jumps up and down, and you can smell gas when you fist statrt it but there is no leaks,also when your driving about 45mph it puags down until you push it and then runs fine. please help me with this issue.

your fuel pump has went in retirement and needs a facelift and needs a new one Im sorry this is not the answer you wanted but this happens a lot every day.please dont grade me to bad,I hope this helps you

Being that it is a 90 model and fuel injected the pump is in the tank along with the sending unit.