'95 Suburban Crank Hard Start/No Start
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Joined: Aug 2019
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'95 Suburban Crank Hard Start/No Start
Hi all,
I’ve been having an issue recently in that the engine will crank and start from a cold start but it takes 4 or 5 attempts to get it to fire and stay running. I always wind up giving it gas by stepping on the accelerator but I’m not sure if that’s actually helping or it’s co-incidental.
Once it’s going it runs ok and you can drive where you want to go but if you stop anywhere, It will not start again until enough time has passed, (about 3 hours?) presumably for it to cool down.
It also has a tendency to stall from standing starts (no matter if it’s warmed to operating temp or not) and if that happens it will not start until enough time has passed.
This is what I checked so far:
Check Engine Light = NOT on. No codes just repeated ‘12’ (using Paper Clip method)
Vacuum good = 19”Hg steady
Air Filter = Removing Air Filter did not help
FUEL:
Fuel Pressure when running = 11psi steady
Fuel Pressure when key in start POS engine off = 11 psi (drops back to zero when Fuel Pump stops)
Fuel Pressure Regulator = Visual inspection revealed Diaphragm not leaking, spring strong?, not broken.
Fuel Filter = N/A removed for testing
Gas Cap = Removing Gas Cap did not help
Pouring Fuel down TB throat did not help
Spraying Starting Fluid down TB throat did not help
ELECTRICAL
Alternator = Putting out 13v/14v to the battery
Battery = New (Replaced after issue start. previous battery was 1000 CCA)
Cables = Good
Starter = New (Replaced after issue start. 12.4 v getting to Starter B+ from Batt)
IGN Switch = Bypassing with remote starter did not help
Neutral Safety Switch = bypassing with remote starter switch did not help
Spark Plugs = Tanish colour. seem OK (Removed two random plugs)(will check with OTC HEI Spark Tester as soon as I acquire one)
OTHER:
MAP = Disconnecting electric connector to MAP did not help
EGR = Unplugging vac to EGR did not help. (NOTE there was no vac coming from square black unit just ahead of EGR but the black unit has Vac going TO it.)
Any help would be greatly appreciated!
Cheers!
tonyfalcon
I’ve been having an issue recently in that the engine will crank and start from a cold start but it takes 4 or 5 attempts to get it to fire and stay running. I always wind up giving it gas by stepping on the accelerator but I’m not sure if that’s actually helping or it’s co-incidental.
Once it’s going it runs ok and you can drive where you want to go but if you stop anywhere, It will not start again until enough time has passed, (about 3 hours?) presumably for it to cool down.
It also has a tendency to stall from standing starts (no matter if it’s warmed to operating temp or not) and if that happens it will not start until enough time has passed.
This is what I checked so far:
Check Engine Light = NOT on. No codes just repeated ‘12’ (using Paper Clip method)
Vacuum good = 19”Hg steady
Air Filter = Removing Air Filter did not help
FUEL:
Fuel Pressure when running = 11psi steady
Fuel Pressure when key in start POS engine off = 11 psi (drops back to zero when Fuel Pump stops)
Fuel Pressure Regulator = Visual inspection revealed Diaphragm not leaking, spring strong?, not broken.
Fuel Filter = N/A removed for testing
Gas Cap = Removing Gas Cap did not help
Pouring Fuel down TB throat did not help
Spraying Starting Fluid down TB throat did not help
ELECTRICAL
Alternator = Putting out 13v/14v to the battery
Battery = New (Replaced after issue start. previous battery was 1000 CCA)
Cables = Good
Starter = New (Replaced after issue start. 12.4 v getting to Starter B+ from Batt)
IGN Switch = Bypassing with remote starter did not help
Neutral Safety Switch = bypassing with remote starter switch did not help
Spark Plugs = Tanish colour. seem OK (Removed two random plugs)(will check with OTC HEI Spark Tester as soon as I acquire one)
OTHER:
MAP = Disconnecting electric connector to MAP did not help
EGR = Unplugging vac to EGR did not help. (NOTE there was no vac coming from square black unit just ahead of EGR but the black unit has Vac going TO it.)
Any help would be greatly appreciated!
Cheers!
tonyfalcon
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