Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Is the check engine light on?
This engine has a fuel injection assy under the intake. It sounds like the engine may be running rich due to an injector leaking. Loading the intake the fuel while it sits. Here is a bulletin on the issue. Cleaning may help. But replacement may be needed. To know for sure we need to have a scan tool to see O2 sensors and fuel trim readings.
Here it is
You may try adding fuel cleaner to the gas tank. I would double or triple dose it. May take several times.
When the ambient temp is cold it requires more fuel on start-up. Hence choke on a carb. When hot less fuel. More fuel hot then it loads on start-up and take a few seconds to clear the intake and smooth out.
If you have ran fuel cleaner through it with no results, I have also seen the fuel pressure regulator leak on these fuel injection assy. The regulator come with the assy or can be paused separately.
Sorry. Purchased separately.
I am going to opt out now. Thank You
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you still dont get an engine light?no codes?
but it has gave a 300 code?
tell me,,did you give it a tune up?
yes i understand
ok,,i will give you my thoughts on the matter if you like
sense it isnt giving any codes and from the way you explain..
there are a few things that can do this
you need to remove a clean the egr valve,though most times when they stick,it will give a code,i have seen them not give a code..so remove and clean it,it is free and easy to do
replace the ect sensor,,[engine coolant tempeture]..this is what tells the computer the engines temperature and adjusts the fuel accordingly..these can go bad and not give a code..it can starve the engine of fuel or give it too much fuel when they are bad..
the ect ussally cost less than $25
the crank sensor,these crank sensor can give a fit with temperature and not give a code.they can cause a missfire or completely stop the injector pulse when they get hot if they are bad..the crank sensor is located on the passenger side front of the engine near the crank pulley.
and my final thought.
the catalyst converter,,
a clogged catalyst willl cause this problem also,you need to take it to a muffler shop to have them test your catalyst converter
if i were going to pick one of those,,i would think your problem is the crank sensor
stnd by,,i will upload the locations and tests/checks for the 300 code
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if it wasnt the crank sensor
the ignition module is possible,,,,i would think it is for certain an electrical component breaking down with heat..yes,the ignition module is possible