Questions and Answers
Blazer Hard Cold Start
Q. I have a 1987 Chevrolet K-5 Blazer with 350 cid engine, throttle body fuel injection and automatic transmission. This truck has "hard starting" problems. Everything is OEM, including ignition system, and is up to date on all maintenance: spark plugs, wires, fuel filter, air filter, oil & filter, newer battery with welding lead and solid copper ends, ect.
I have two other Blazers, one having almost 400,000 miles on original engine, the other with over 200,000 miles. They both start immediately with the first try. I would really like to have the 1987 start quicker also. Ignition coil checks out as does all connections that I have tested.
Thanks for all the help in advance!
LitoA. You don't mention how long it takes to start so I'm going to assume it's much longer then would be considered normal.
There are several reasons why an engine will start hard cold. It could be a binding or sticking Throttle Position Sensor (TPS), or a bad TPS. There could be a high resistance in coolant sensor circuit telling the computer it is warmer out than it actually is. Or a loss of fuel pressure sitting overnight. Another possibility is a leaking, binding or sticking EGR valve.
Each one of these is easy enough to check. Since you have replaced most of the ignition parts it should be safe to assume the problem is not there.
Additional Information provided courtesy of ALLDATA
