Driving down the road truck just turns off, engine turns over but wont fire, engine does get spark, we try hooking up a computer and reads error, we buy a new mojo wouldnt work
Look at the keyswitch, I had one that went bad, the starter would still crank but the ECM was not turning on
SOURCE: 1997 Chevy Silverado - engine turns over but will not fire
I was leaving for work, as I started to excellerate, my engine starting getting sluggish, check engine light came on, so I pulled over. As I pulled over it started to smoke, when I opened the hood I couldn't tell where it was coming from. It will turns over but won't start.
SOURCE: 91 chevy blazer 4.3 won't start after running.
Check the ECM for Codes to help you find out what's causing the problem. Here is a simple and easy way to check.
On board diagnostic (OBD) was designed on vehicles equipped with electronic fuel injection so you can generally retrieve the codes yourself. No need buying a scanner or running to any parts stores to check the Check Engine. This system is called obd1 and applies to most vehicles made before 1995 for domestics and 1993 on imports. In this article, I will discuss the methods used by domestic vehicle manufacturers on how to check the engine lights in their cars and Trucks.
For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check Engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.
Counting the codes being flashed is easiest way to trouble shot problems in domestic vehicles and most of the codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Finally after performing repairs on the culprit code, always go for a road test to confirm if the problem is fixed.
Here is a link with the GM codes. http://chevythunder.com/199295_lt1_trouble_codes.htm
Good luck and hope this helps
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