V-6 ...3.8 liter ..Replaced intake lower and upper gaskets...was leaking on top of intake..bled cooling system...had radiator rodded out..replaced rad cap...new t-stat...ohm 2 wires from coolant sensor to PCM both good..Ohmed green wire from Coolant sensor to instrument cluster pin A17 0.3 Ohms good....New sensor ...with scanner plugged in shows 205 F ..Infrared Scanner shows Coolant Sensor at 198 F but dash guage shows 245-250 F,,,tried used cluster...same problem ???
SOURCE: 94 olds hard starts when warm, starts when cold and runs rich
If you can get a fuel pressure gauge, check and see if the pressure is 16 to 24 lbs after the engine has warmed up.
I would connect the pressure gauge when the engine is cold, make sure it does not leak or touch anything hot, place the gauge between the hood and the windshield and drive the vehicle until it is at the temperature you feel it "starts hard". Shut the engine off and try to repeat the no start or hard start and make sure the pressure is correct.
Also, when you shut the engine off, watch the pressure and make sure it holds and does not drop to (0 LBS) of pressure.
One last question, has the fuel filter been changed in the past 30K.
Let me know.
Regards,
SOURCE: Thanks to all the responses I really do appreciate
Hello Taz..might check the converter to make sure the exhaust system does not have excessive backpressure. Also make sure the electronic cooling fans are cycling...they should kick in and out. They are tied into the A/C system circuit with a relay.
The 3.1L and 3.4L V-6 Engine (VINs J, E - RPOs LG8, LA1) were known to have intake gasket failure. This was due to a bad gasket that was designed by GM...it had nylon in it...Over 400,000 of these were sold in Canada alone. The gasket has since been redesigned and torque specs recalculated. If you replace the manifold gaskets follow these guidelines.
Install a new design intake manifold gasket. The material used in the gasket has been changed in order to improve the sealing qualities of the gasket. When replacing the gasket, the intake manifold bolts must also be replaced and torqued to a revised specification. The new bolts will come with a pre-applied threadlocker on them.
Notice
An oil leak may result if the vertical bolts are not tightened before the diagonal bolts.
Diagonal bolts may require a crows foot to tighten.
Tighten
1. Tighten the vertical lower intake manifold bolts (1) to 7 N.m (62 lb in).
2. Tighten the diagonal lower intake manifold bolts (2) to 7 N.m (62 lb in).
3. Tighten the vertical lower intake manifold bolts (1) to 13 N.m (115 lb in).
4. Tighten the diagonal lower intake manifold bolts (2) to 25 N.m (18 lb ft).
Good luck...i hope this helps.
SOURCE: 97 transport 3.4 engine- New radiator,
Are your cooling fans working? that will definately be a problem if not working. if they are working shut car off and feel the radiator is it the same temp all over or is it hot in only top or one smaller area. if you do not have same temp feeling on all of radiator your radiator may be plugged.
SOURCE: 92 dodge 3.0L overheating with or without
i have a 3 liter that over heats and boils aver aswell. The first time this happened i could not figure it out. i changed the thermostat and tested the fan. the fan always cut in. i even took it off and hooked it strait to 12volts. i drove it around for a couple of minutes and it got hot agian. well it was hot i turned the a/c on witch should automaticly turn the fan on and it didn't turn on. after more testing i found that for some reason that the fan would work most of the time but not always. it seemed when it missed a cycle for some reason it never caught back up until the engine cooled down from being turned off. i changed the fan and it worked great. for about a month. i changed the fan and it worked again for about another month. my suggestion is head for a post. worked good for me. hhah
SOURCE: High idle on 98 chevy 5.7. changed Intake
REPLACED IDLE AIR YOU HAVE TO ADJUST ITS DIMENSION. MEASURE FROM THE TIP OF PINTLE TO THE MOUNTING FLANGE.YOUR DISTANCE HAS TO BE 1 1/8 INCH.IF NOT ADJUST PINTLE BY PRESSING IT 1 1/8 INCH. YOU NEED TO RESET IDLE BY CYCLE THE IGNITION KEY ON FOR TEN SECONDS THEN OFF FOR TEN SECONDS TO RESET THE VALVE.START THE ENGINE ALLOW IT TO IDLE FOR FIVE MINUTES TURN THE ENGINE OFF FOR THIRTY SECONDS THEN START THE ENGINE AGAIN AND CHECK THE IDLE OPERATION.
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