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Post by 5buckeye5 on Aug 24, 2014 15:58:46 GMT -6
I just found your sight, hopefully I can get some help here. I own a 2001 Aurora 4.0 ( wifes car ) 91,000 miles. Found you people looking for info on changing the plugs ( very helpful ). I got the plugs changed ( what a job the rear ones are , no room ) Still have a Po 171 and a Po174 code Lean bank system 1 and 2 , are there any flow charts to access so I would know what to test. Thanks for any help I will get
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tigger
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Post by tigger on Aug 24, 2014 17:07:41 GMT -6
First, welcome to the club!
P0171 and 0174 at the same time is commonly the result of unmetered air. Check all of your vacuum hoses and around the intake manifold for air leaks. Wouldn't hurt to clean the MAF if it hasn't been done recently. Good luck!
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Post by 5buckeye5 on Aug 24, 2014 20:42:19 GMT -6
Thanks I bought some maf cleaner today as soon as I get a chance to clean it I will let everyone know if it helps
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Randy T.
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Post by Randy T. on Aug 25, 2014 6:09:12 GMT -6
Welcome to the club! You may also check your anti-backfire valve in the end of the intake, it is on the passenger side of the intake, look with a flashlight and you should be able to see it, push it around both ways and see if you have any movement, pull on the backfire door and make sure it sits secure.
I would also recommend checking your coolant crossover gaskets, they are on the drivers side, on a pipe the connects the heads together, the same pipe also houses the water pump. Coolant crossover gaskets are usually bad on every Aurora if they have not been changed.
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Post by 5buckeye5 on Aug 25, 2014 15:59:32 GMT -6
Didn't know there was such a thing as an anti back fire valve, is there a gasket that goes bad or is it just the door that gets to where it doesn't function right. About the coolant cross over gaskets, would they let air in or leak coolant. I did change the water pump last fall. There isn't anything you work on on this vehicle that doesn't require a lot of dis-assembly.
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Randy T.
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Post by Randy T. on Aug 26, 2014 6:38:49 GMT -6
On the anti-backfire valve, both of those things can happen, but if the door itself is messed up, it would probably make a pretty good sound. Yes also to the coolant crossovers leaking coolant or allowing air to enter the system, I know from experience from working on '97-'03 Auroras and Cadillacs, every one has had bad CCGs, if you look with a flashlight, you may see one bulging out the side. Some Ford V8s use the same type of gasket, and they have the same problem.
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Paulaurora
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Post by Paulaurora on Aug 28, 2014 8:48:34 GMT -6
Check the BOOT between the TP and the engine thats the most common issue with 4.0. spray some carbon cleaner on it and see if it will suck it in or will cause engine to stall.
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Post by 5buckeye5 on Aug 29, 2014 13:54:46 GMT -6
Okay I sprayed carb cleaner between the throttle body and the intake and the the vacuum leak is there. Do you think it is the throttle body gasket or something else. Looks like there might be something between the TB and the intake.
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Post by kbpickle on Aug 29, 2014 18:11:24 GMT -6
On my car the leak was on the underside of the rubber boot, on the inner crease of the accordian fold. Impossible to see just looking into the engine bay.
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Post by 5buckeye5 on Aug 29, 2014 18:23:49 GMT -6
Alright I pulled the throttle body , the bolts were barely tight at all. That boot between the intake and the throttle body looks like it might be a pain. It looks like either the intake has to come off or the crossover has to come off. Hope I'm wrong. do you think the loose throttle body bolts might be the leak. I could have taken them out with a socket on a screwdriver handle. They suprised me how loose they were. Well I pulled the throttle body off and cleaned it, reassembled and now I have a very high idle with the throttle closed, ( around 2000 rpm ) I'm thinking since the throttle body bolts were so loose when I torqued them to specs. maybe it opened up the boot on the intake connector. and is letting in a lot more air. It wasn't idling high when I fist started it up, it got higher on my test drive, just got higher the further I drove it. Any opinions?
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tigger
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Post by tigger on Aug 31, 2014 18:32:46 GMT -6
Alright I pulled the throttle body , the bolts were barely tight at all. That boot between the intake and the throttle body looks like it might be a pain. It looks like either the intake has to come off or the crossover has to come off. Hope I'm wrong. You aren't.
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Post by awehlage on Aug 31, 2014 22:22:56 GMT -6
I currently have P0171/P0174/P0300 and flashing CEL. My car got diagnosed Friday and it was a leaking plenum gasket and leaking dirty PVC tube.
Will be replacing those along with the manifold gaskets tomorrow.
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Post by 5buckeye5 on Sept 1, 2014 8:53:37 GMT -6
Just did this last weekend due to the lean codes, P0171/0174, I was getting. There's 8 individual gaskets, one for each runner and the mating boot that connects the intake to the crossover. Suggest you replace these while it's off. You can go one step further and also remove and clean the throttle body and replace the gasket(I did) since you have to take the 3 bolts holding it in order to change the intake/crossover boot.
1. Remove the airbox 2. Remove brake booster hose from throttle body 3. Remove vac line to FPR 4. Remove PVC tube to front valve cover 5. Remove the coolant tube that runs to the overflow tank and set it to the side 6. Remove the evap purge solenoid mounted on the back valve cover and set it to the side 7. Remove the fuel rail. I could not get the injectors to come out of the intake, so I disconnected them at the top of the injectors at the fuel rail. Just push the tab back and the rail will come off the injectors. When putting it back together, put some clean oil on the o-rings to ease the insertion of the injectors. Also make sure the injectors are oriented correctly and snap back into the tabs on the fuel rail. I didn't disconnect the rail from the fuel lines, I just took them out of the holders on top of the throttle body and on the firewall and carefully set the whole assembly where the airbox was while I removed the intake.
When reinstalling, the 3 throttle body bolts are torqued to 89 in/lbs. The intake is 89 in/lbs. Fuel rail stud is 80 in/lbs. Boot clamp is 24 in/lbs.
Just removed the intake,followed Oldwinos instructions that I pasted above. not to bad of a job just follow the instructions above. Now how good does it need cleaned, I assume the injector mounts and the gasket area and the end the boot connector mounts on. I'm just wondering about the inside or do you just let sleeping dogs lie. Also I don't have an anti-backfire valve on the back of the plenum ( at least I don't think, not like what I saw pics of on another thread ) I have an 01, 4.0 And thanks Oldwino for the excellent instructions
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Post by 5buckeye5 on Sept 2, 2014 19:46:02 GMT -6
Well I got it back together tonight and everything seems to be okay. I want to say thanks to everyone who responded and for oldwino's good instructions. it goes easier when you no exactly what to remove and not waste time removing things that don't. I've still got a few things wrong so I'll be hanging out and reading. Once again thanks.
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Paulaurora
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Post by Paulaurora on Sept 2, 2014 20:29:29 GMT -6
Good that it worked
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Post by guy48065 on Sept 3, 2014 6:47:42 GMT -6
I took mine in to the local Caddy dealer to diagnose my surging idle and just got the call that it's the intake plenum gasket. Repair cost will be $422 including $71 diagnostic fee. Does that sound about right for the complexity of the repairs? Caller didn't say anything about replacing *several* gaskets. ..
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Paulaurora
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Post by Paulaurora on Sept 3, 2014 9:03:52 GMT -6
i think its too much $ for this job if they replaced other gaskets at same time and i would recommend doing then. since they be in that area cuz if they fail you will have to pay 400$ again so ask them how much i be the boot and the other gaskets.
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Post by guy48065 on Sept 3, 2014 9:51:20 GMT -6
Well I guess even the Caddy dealer isn't above giving the customer the run-around. I got a 2nd call informing me the price would increase because the seal (singular) isn't available separately and only comes with a new plenum. I pointed out the plenum needs 8 seals and he said he'd talk to the tech and call back. Now he's saying it's not the gaskets underneath that are leaking but the "one behind where the airbox connects to the plenum". Sounds to me like he's describing a $5 TB gasket and of course they're very available. (and I happen to have one on hand) I declined the work & will pick it up. Jeez the one time I opt to pay a pro and I get screwed
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Paulaurora
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Post by Paulaurora on Sept 3, 2014 11:08:15 GMT -6
most shops are much better than a dealer . most dealers just do guess work.
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Post by guy48065 on Sept 3, 2014 15:23:14 GMT -6
Wow! I never let him tell me the new total so when I got there to pick it up I saw they wanted $919 to replace the plastic intake plenum.
He pointed to the problem spot as the black steel plate between the TB and the plenum/accordian. I can't find any intake parts on Rockauto so what's this gasket called & where do I look for it?
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tigger
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Post by tigger on Sept 3, 2014 15:30:10 GMT -6
What number?? 540 is the "boot".
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Paulaurora
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Post by Paulaurora on Sept 3, 2014 16:02:33 GMT -6
this the one www.amazon.com/APDTY-Throttle-Manifold-Coupling-Replaces/dp/B00BVB4T3Qand you might get this part free if u dont have Amazon card "Your cost could be $0.00 instead of $24.00! Get the Amazon.com Rewards Visa card and you'll automatically get $30.00 off instantly as a gift card." and it comes with the extra gaskets that you need Q: Are the blue intake gaskets included with this A: yes they are.
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tigger
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Post by tigger on Sept 3, 2014 16:15:24 GMT -6
^That's a pretty good deal. Those intake gaskets are usually a few bucks each!
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Post by 5buckeye5 on Sept 3, 2014 17:16:19 GMT -6
I paid 24.59 at NAPA and it came with the 8 Gaskets also. It wasn't to bad of a job, its just that I never had pulled an intake on a fuel injected vehicle before. Now that I have, I wouldn't hesitate to do it again. Just print out oldwinos instructions and follow them. took me about 4 hours over 2 nights including cleaning everything up. (I take a lot of breaks, I'm getting older and not used to working over a car engine so the backs of my legs started to hurt. 2nd night was better so I must have got everything stretched out). Go buy the parts and save the money for a night out or something special. Any problems and you can get all the help you need here.
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Post by awehlage on Sept 3, 2014 18:54:55 GMT -6
So glad you could do it yourself! The dealership I went to quoted me $450 for the exact same repair plus a broken PVC dirty air tube. I already had the manifold gaskets so the new plenum to crossover gasket was $20 and the PCV tube was another $20!
Nothing like getting charged double the labor when they have everything disassembled!! Money suckers....
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Post by guy48065 on Sept 3, 2014 19:53:42 GMT -6
I see the part is called an "intake plenum" so if I were feeling generous I could assume the dealer thought that meant the big 8- runner plenum and gave me the price and book labor rate to replace THAT. OR maybe they actually do charge $900 to replace that $20 boot. Either way I'm doing it myself.
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Post by awehlage on Sept 3, 2014 20:49:39 GMT -6
Since I've owned my Aurora I still have a hard time wrapping my mind around how the FSM calls a part a different name than what an OEM part is called in the catalog. It has really confused me at times and even caused me to purchase the wrong part. That's why I go strictly by p/n's now!!
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plato442
Aurora Driver
Life, Liberty, and the pursuit of Oldsmobile...
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Post by plato442 on Sept 3, 2014 22:13:30 GMT -6
Yeah part numbers are a sure way of getting it right. I've noticed a lot of different parts being called different
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tigger
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Post by tigger on Sept 3, 2014 22:37:22 GMT -6
Exactly, an hour of research is surely worth than an hour of shop time. Diags are getting close to the price of a mid-level scan tool. DIY!!
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Post by 5buckeye5 on Sept 4, 2014 11:25:18 GMT -6
Yeah I don't mind paying a fair price for a job, but I don't like getting screwed ( without so much as a kiss or flowers LOL ). 175- 200 tops parts included would seem fair to me.
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