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96 Chevy S10 Blazer with 4.3 L engine vortex will turn over but won’t start. Why?

Asked by HeatherGreene Jun 29, 2013 at 08:14 PM about the 1996 Chevrolet Blazer 4 Door LS 4WD

Question type: Maintenance & Repair

The RPM’s fluttered and it died. The PCM code read that it was the crankshaft sensor.
We have checked the following:
coil – replaced
fuses – good
control module (ecm) – replaced
plug wires – replaced
crankshaft sensor – replaced
voltage at connector to crankshaft sensor – is good
battery voltage while cranking – is good
spark – none (before we replaced the crankshaft)
vacuum lines – replaced
air filter – new
distributor cap and rotor – replaced
vent valve – is good
cranking voltage is good
battery ground – is good
coil wire – is good
MAP sensor – is good
PCV valve is good

The engine turns over fine, but will not start. We have disconnected the positive cable
to the battery for more than 10 minutes, and that did not resolve the issue. There are
no codes showing in the PCM any longer, but that might be because we replaced the
ECM. We don’t know for sure. Shouldn’t the PCM store the codes even though we
disconnected the battery? That is a side question. My biggest question is what do we
do next? We can hear the fuel pump come on. We do not smell fuel while we are
cranking the engine.

78 Answers

Amanda answered about a month ago

50 psi isn’t enough, don’t use starting fluid you’ll destroy your intake manifold. open upper plenum, if it’s got clean spots you have a bad cpi if not check out your fuel pressure regulator, it’s a trouble maker. My 95 4.3 blazer has been a total pain in my butt. my cpi failed, flooded the engine, which then hydrolocked the engine resulting in a clank when I turned the key. Took a month Of arguing with a man about the starter not being bad and buying a new One and getting the same result before I found the answer to that One, (pull the spark plugs out, let the gas evaporate out of the engine for a few days, Get new plugs, it will turn over fine, but if it flooded in the first place check under the upper plenum, clean spots around the injectors mean you need a new cpi. Clean spots at the back where the gas comes in mean you need a new fuel pressure regulator) new Voltage regulator is internal to the alternator, but before you replace that, check the 8 Gage wire running from the back of the alternator to the battery, that was my intermittent electrical problem. Replaced that and no more trouble with battery, now the truck won’t start with my heavy key ring but starts right up with the light One or just the key, but that’s a Chevy thing, they don’t like weight On the ignition lock cylinder. Already replaced that once, just ditched the extra keys and it starts fine, but it’s running like crap, pretty sure I need a new pcv valve, it has all the symptoms.

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