i have a 91 sunbird 2.0l ,car starts with ether and stays running ,shut off wont start

Asked by silverado_2150 Jan 15, 2017 at 12:42 PM about the 1991 Pontiac Sunbird 2 Dr LE Coupe

Question type: Maintenance & Repair

grounded dt port fan comes on got 34 code(map sensor) ,changed map and coolant sensor no change put noid light on no pulse when cranking,any ideas would be great

4 Answers
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beatupchevy answered 7 years ago

Without the injector pulse I don't think anything will happen. The pulse probably comes from computer I'm not sure ,ignition modulator ? ?, look on u-tube there are many useful car repair vids.

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Roadking65 answered 7 years ago

Stupid question, but did you check all the injector plugs? No pulse from any then I would suspect the ECM. My service manual for my 94 2.0L says the ac low press sensor can read too low (out of range) and cause a no start signal. Says unplug sensor and try starting. If starts replace it. Also says same thing about the MAP sensor but you have replaced it already.

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Roadking65 answered 7 years ago

There is a fuse for the ECM. If your check engine light stays illuminated when you turn key to ON and leave it there its most likely good. There is a 50psi fuel requirement for the injectors to work. Once started the fuel regulator reduces that to 7-8 psi. But it must produce (47psi, I think) to get the injectors to open. Hope this helps

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