Can't get it to start in the Morning

NELSON89GMC

MEMBER
1989 GMC SUBURBAN
172,535 MILES

Mileage registers only 72,000 but Almost sure it has tripped we have 1989 gmc suburban 5.7 tbi running normally one morning just wouldnt start. Has fire, has fuel when it decides to work. Have changed fuel pump, injectors, filter, water temp sensor, and now we are getting code 15. Will not crank early in the morning

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Have the ignition switch checked-start here

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Tuesday, January 10th, 2012 AT 11:11 PM

RASMATAZ

MECHANIC
75,992 POSTS

Test the coolant temperature sensor-

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Tuesday, January 10th, 2012 AT 11:15 PM

NELSON89GMC

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5 POSTS

Well. We did relace old temp sensor with a new temp sensor and have chk'd connection for power and it does have power at the plug there. Not the ignition switch because it always turns over. Have chk'd all the grounds I could find. And have tried to follow all wires to chk for knicks or something. Please more advice. Lots, thanks ---

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Wednesday, January 11th, 2012 AT 7:10 PM

RASMATAZ

MECHANIC
75,992 POSTS

Okay-check the fuel pressure if its correct if okay -look for spark and double check the ignition switch

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Wednesday, January 11th, 2012 AT 9:27 PM

NELSON89GMC

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5 POSTS

Just wanted to let you know it was a bad m.A.P. Sensor and the wire connectors to the temp sensor that had my truck acting all crazy. Hope this helps someone else, thanks again.