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1997 Deville rough start


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I have a 1997 Deville and it is starting rough

Seems to turn over fine but hesitating before start

The problem happen when cold and hot

The problem seem to be getting worst

No codes

Battery is old but I would like to not start by replacing parts before I diagnose problem

Any ideas

I did use sea foam with a full tank to see if it would help but no positive results

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Any misfires?

I would check the fuel pressure regulator first, although it is probably time for plugs + wires also.

Bruce

2023 Cadillac CT4-V Blackwing

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You check the fuel pressure by getting a fuel pressure gauge at your local auto parts store and hooking it into your fuel line at the inlet side of the fuel rail. The fuel rail is under the engine top cover that is held on with four cap nuts. The inlet side is toward the front of the engine on the driver's side.

Another likely culprit is plugs and wires. Start the engine at night with the beauty cover off and someone (you, preferably) looking at the engine and see if you can spot arcing. If it's bad, you can hear it too.

For obvious reasons, don't do these tests at the same time. In fact, if you aren't experienced in dealing with fuel systems, look into safety procedures before you take a wrench to a fuel line.

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Thank you for the input

I think checking the fuel pressure is more than I want to get into .

If it were fuel pressure than what could the issues most like be

Fuel filter?Is this a big job?

Fuel Pump?

Fuel Line?

Other?

How likely would it be any one of these ? Is this a common problem?

Where do you like to buy your parts?

My other car is a mercedes and many of the member post photos of the Job .

Do you do that here?

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If it were fuel pressure than what could the issues most like be

Fuel filter?Is this a big job?

Fuel Pump?

Fuel Line?

Other?

The fuel pump provides pressure, so if it is a low pressure problem, the culprit it the pump. Hard to say how likely it is. You just have to start the process of elimination. Rockauto has good prices and fast shipping. http://www.rockauto.com. If it is a dealer only part, then http://www.gmotors.com

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How many miles does your your car have on it?

If it is over 80k than replace the spark plugs. Use AC Delco 41-950, not another brand or style.

The gap is .050"

-George

Drive'em like you own 'em. - ....................04 DTS............................

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Thank you for the input

I think checking the fuel pressure is more than I want to get into .

If it were fuel pressure than what could the issues most like be

Fuel filter?Is this a big job?

Fuel Pump?

Fuel Line?

Other?

How likely would it be any one of these ? Is this a common problem?

Where do you like to buy your parts?

My other car is a mercedes and many of the member post photos of the Job .

Do you do that here?

You're going to have to check the fuel pressure - that is the most basic step in the troubleshooting process. Don't waste time or money replacing the fuel filter - it is sided such that it last the life of the car.

Some auto parts stores will loan a fuel pressure gage - just attach it to the fuel rail and turn the ignition to ON. Very simple.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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