20 Most Recent 1998 Oldsmobile Regency Questions & Answers

How long since overall tune-up? Use a gage and check proper fuel pressure, key on engine off. vin K 48--55 psi. Also, check that the fuel pressure will hold for bit, with the key off. Check fuel trims when problem is ongoing, see if trying to add or remove fuel? If temp related check the coolant temp sensor. Over-fueling on a hot engine can make it hard to start. Pushing the pedal to the floor should put it in "clear flood mode" and help it to start. Could be other issues?

Here's a link to your fuel filter,first remove fuel pressure. Component Locations Fuel Filter AutoZone com

On earlier charging systems that used a separate voltage regulator some used a separate unit to control the ignition light and this might be the trouble - check with a wiring diagram. If it is a an integrated regulator type the warning light wire connects directly to the alternator and all it does is ground the earthy side of the battery light through the rotor winding until the regulator begins to energise the rotor via the auxiliary diodes. With smart charging systems and probably with later CANbus systems the battery light is controlled by black boxes.

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You most likely have a short to ground in the supply circuit. Work from the bulb socket backwards to the fuse. Check between the hot supply line to ground there should be not circuit when the fuse is out. If you find one at any point, the short is between the last 2 points you checked. As a visual inspection, look for any blackened metal around any of the contact points that will usually indicate a short.

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For now you know the Dex-Cool ate the intake gaskets, so off with the intake There are newer gasket materials out for that issue & I would pick a different coolant If you read ALL the coolant bottle labels, you can find, in any store,they ALL are Dex-Cool chemicals There is no more old green coolant & NO one size fits all Prestone is just dex-cool & lots of non-sense on the labeling I would use Zerex G-05 even though it is for ford & chry & others Still have the same engine block,heads,heater parts,radiators, on all vehicles,so it won't hurt anything, if you use ONLY distilled water & coolant. Do a cylinder leak down test first, to confirm proper valve sealing & hopefully good head gaskets Going to need new oxygen sensors, once the repairs are made. I would pull the injectors & mail away for Ultra-Sonic Cleaning They are 16 plus years old & no other cleaning will do a thing. They are too old to use & not be tested & cleaned off vehicle

u can get to the hoses thru your radio port pull stereo out u will see hoses

Check battery and connection,when start up try move steering wheel left to right.

here's your code. P0440 OBD II Trouble Code

It will be located in a housing near or on the water pump.

It's definitely the head gasket from what you described. If it is a v-8 like I think it is then its better that you replace both head gaskets or you'll be going back and doing the other one . If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

Your intake manifold may be cracked. It is plastic and is know to cracking. If you take a flash light and look behind the intake, you should see a small puddle of antifreeze or a slight crack. You will need to replace the intake manifold and the gasket, possible do a complete head job on the car since it is already leaking through. If you need further help, I’m available over the phone at https://www.6ya.com/expert/sam_2aa3897a693549cc

My bet is on a bad Oxygen sensor for the random misfire. Don't forget there are upstream and downstream Oxygen sensors. Check the Rock Auto site for prices. It looks like you can replace both for about $60.