Re: runs bad in hot days, good in cold days. 89 benz
It could possibly be your temperature sensor. I had a Buick with the same problem. In winter, it ran fine. When the weather warmed up, the car would sputter and die. A defective temp. sensor will cause your car's ECM to mis-read the coolant's temp. So it will adjust your fuel input as if the outside temp. was -30,causing an over-rich fuel mixture.
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Holts Wondarweld Flush engine. EXTERNAL CRACKS 1 Run engine until hot,drain off enough coolant to remove thermostat. 2 Remove thermostat. 3 Mix contents of can thoughoughly! and pour contents into thermostat opening. 4 Replace thermostat cover.& fill radiator with hot water,replace radiator cap. 5 Run engine at a fast idle for 15 mins,dont allow to boil.Top up if necessary. 6 Leave Wondarweld in system for 2-3 days then drain off,flush system replace thermostat and refill. HAIRLINE CRACKS 1 MIX thoroughly and pour into cold engine (radiator if it has a cap) 2 Run engine until hot. 3 Allow engine to cool then run again until hot. 4 Follow procedure 6 above. INTERNAL CRACKS 1 Follow external crack instructions except after pouring Wondarweld into engine remove spark plug from affected cylinder and run engine for 20 mins. If more than one cylinder affected run for 5 minute intervals. 2 Allow engine to cool then drain cooling system and refill with clean water. 3 Drain sump & flush,refill with fresh oil. Note:- 1/2 pint of Wondarweld for every 6 pints of water,DO NOT add antifreeze for at least 3 days after process.
When you say you checked the pressure did you connect gauges to the high and low sides to get both pressures, this sounds like it may be low. also what is the temp coming out of the vents. note on really hot days and humid the ac system doesnt cool as good unless the truck is moving down the road or highway and does take a while to cool down. at a stop or sitting or in traffic the ac temp will rise as the condensor needs to be cooled like the engine does, if its not cooling then the temp will not be cold, check the front of condensor for blockage, also make sure the fan is running with ac on. this fan should run when ac compressor is on,maybe clean condensor with water hose blowing from radiator outwardto front bumper, then make sure the hot/cold blend door is closing all the way,a quick test is to turn a/c on, turn temp control to hot and see if it gets hotter then back to cold and it should get colder. this sounds like the system may just be a little low. have an a/c tech check it, you may find its low or nothing is wrong. good day.
I'd have fuel pressure tested. I had a 95' did same thing. Cold winter day, worked fine, as soon as it got warmer, or hot out, it would quit, and re-start 20 minutes later and go for a distance then die again. If I parked in the shade on a hot day, I'd get further before it quit for the first time. I started carrying a fuel pressure gauge with me. Cool in the morning my fuel pressure was up to spec @ 49-50psi. Once it got warm/hot out and it died, Hooked up gauge and it was at 2-5psi. Let it sit and cool off 20-30 minutes, pressure would jump back up and run good until fuel pump got hot again and then pressure dropped off and car quit. It sure sounds like the fuel pump, but the hard part will be getting the car to the shop at the right time, or they will need to let it run on the lot until it quits to confirm the pressure drop. One thing you can try is when car quits, have a can of WD-40 or quick start with you and a screwdriver. Loosen the clamp on the air intake hose where it connects to the front of the throttle body and pull it off. With vehicle off, turn throttle linkage so the plate opens up enough to spray WD-40 a second or 2 in the throttle body. Then try to start it. If it starts and runs momentarily, then you can be pretty sure it's fuel related and my guess is the pump needs replacement.
Cheap trial repairs.... With the engine cool.....
Pull the thermostat from the top of the engine block - at the point where the top radiator hose connects. Restore the hose connection and try running the car to see what the temp does. If this is the problem, the engine will run cold all of the time. (you should install a new thermostat).
If not the problem, on a cool engine, drain the radiator and insert radiator cleaner. refill with water and run for a few days. Drain and then flush with hose until water runs clear. Fill with 1 gal of antifreeze and the rest water.
Has Neon do same, I ran fuel at low level, on hot day, ran engine until it started to act up & threw a fuel pressure gauge on it. Was at approx 5 psi. Cold next morning, 48-50 psi. Always hot day about 30-40 miles into work in morning, o.k. Sit in hot sun all day & would happen 3-4 times on way home. Sit and let cool, 20 minutes or so & go again for a while. Cool day, no problem. Change pump I would.