RDS928S

Today my 86S developed hard starting problems. The engine catches upon start up then instantly dies.
Usually takes 3-4 starting attempts to catch. Sometimes I have to feather the gas pedal to keep it running.
Then on other occasions it will fire up on the first crank?

Anyone been down this path before?

Thanks Rich

bd0nalds0n

I don't know if it's like the S4, but when I had hard cold start problems, it ended up being the temp2 sensor. It richens up the mixture when the car is cold, making it easier to start and keep running until it warms up. In my case, the sensor had started coming apart, so that the wires weren't making contact correctly.

jheis

Replace your fuel filter before you try anything else.

James

RDS928S

fuel filter & pump have already been replaced.

Rich

fraggle

Check the wiring on the impulse sensor. Mine was flakey and had some trouble, just before it totally died. It was shorting to the block. If the car fired up, vibrations would keep the signal running good enough to keep it going.

tomcat

Rich,

Did you change your oil/add oil recently? I have had some stalling/starting problems lately. During my last oil change I added oil up to the top hash mark. My guess is oil is getting into the ISV. Draining oil tomorrow to get to the bottom hash mark to see if things change.

hacker-pschorr

This is a very easy item to check / replace. Faulty temp sensor will not tell the computer to run the full rich startup cycle - causing this exact issue.

RDS928S

Oil was changed in early spring. Not an issue.
I guess I will change out the temp sensor since everything else has been replaced. Is it called the temp II sensor?
It's a funny thing for the last week it fires instantly to an idle. Then all of a sudden a few weeks later te starting problems re-develop?

Thanks Rich

I

killav

1. Fuel Check Valve
2. Temp sensor II
3. Vacuum leak at or around ISV

Try these things first.

hacker-pschorr

Not sure if this is on every year - but the early cars have two temp sensors not that far from each other. One feeds the temp gauge, the other tells the computer the engine temp.

Jean-Louis

Check the fuel pump again..........

SteveG

Facing the engine, it is front top, left of center, near oil filler.
If the sensor is intact, I wouldn't remove it. You can check the resistances at the sensor, removing the plug, there are two pins inside. Both pins should have similar readings. Temps are Cent., readings are Ohms:
0 = 4.4 to 3.6 k Ohms
15 to 30 degrees = 1.4 to 3.6 K
40C = 1.0 to 1.3 K;
80 C = 250 t0 390 ohms.

If the readings check ok, then you need to ascertain the reading is reaching the EZK, pins 18 and 19.