1996 Chev Suburban Other - Engine

Question: I bought this vehicle last week. It is difficult to start. You have to depress the accelerator pedal and then it starts. There are no codes showing up.

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Technican: Lets start with the easy potential causes. Replace the fuel filter and run a can of STP or similar fuel treatment. Also it is a great idea to always do a full tune up on a newly purchased car or truck. Let me know if this helps. We can go from there.

Owner: I have replaced the spark plugs, wires, cap and rotor, and have run a can of Red Line fuel injector cleaner through it. I have not changed the fuel filter yet. Will do that tomorrow.

Owner: I changed the fuel filter and the starting problem still persists. Derek

Technican: Check the idle speed motor. Cleaning the pintle on the motor and the passageway might do the trick.

Owner: Thanks for your reply, I do not know the Vortec 5.7 L. Where can I locate the idle speed motor? Thanks Derek

Technican: Here is a link to a free online repair guide offered by autozone. Highlight, edit, copy, and paste the link into your address bar. autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/08/6e/39/0900823d80086e39.jsp Note- click diagrams at the above site to open in a new window. If this don't work you will need to check fuel pressure. Let me know.

Technican: Hi; Sounds like the TPS ( throttle position sensor is not telling the computer theactual position of the throttle. Unless youhave a good scanner the position will not be known. Your best bet is to have a shop run a diagnostic test with a scanner.

Owner: Sorry guys, I could not wait for an answer. A search of the internet yielded a solution. I replaced the CIS and fuel pressure regulator (used). The truck starts and runs perfectly. I guess the fuel pressure regulator has been notorious for GM. Derek

Technican: They have been problematic, you were lucky to find a unit in good working condition. Hopefully it lasts. Did you price new units? There is an aftermarket supplier for the regulator, in the event you have been told otherwise. Did you get a good price on the used unit? BTW, if you would of got back to me you would of found the problem quickly once you obtained a fuel pressure gauge. If you had to buy new part$ you'd surely understand the importance of proper diagnosis."

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1996 Chev Suburban Other - Engine

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