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dr.donut
User
Oct 19, 2015, 2:36 PM
Post #1 of 20
(1962 views)
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2002 buick 3.8 MAF MAP
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Is it O.K. to use CRC MAF sensor cleaner on the MAP sensor, I did a search with no answers nor does the produce say anything.
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kev2
Veteran
Oct 19, 2015, 3:18 PM
Post #2 of 20
(1952 views)
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Re: 2002 buick 3.8 MAF MAP
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maf sensor cleaner should not affect it- , cleaning the connector contacts maybe BUT it seams useless, WHAT is the issue?
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dr.donut
User
Oct 19, 2015, 3:48 PM
Post #3 of 20
(1948 views)
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Re: 2002 buick 3.8 MAF MAP
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At first when driving on the highway in commuter traffic you would be going 60mph+/- and have to slow down to 30 or 40, then the car would kind of shudder when you would accelerate , like being in too high a gear, I told my wife to avoid such stops and starts. Then when I was going up a hill at around 30 at low rpm it did the same, like a standard would do if you were in a high gear trying to accelerate. Now it's starting to have this very short power loses at around 30 mph,thats the best I can describe it, kind of the same symptom but momentary.No codes are up and I don't know what determines the shift points so I thought I would clean the MAP sensor.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 19, 2015, 3:57 PM
Post #4 of 20
(1946 views)
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Re: 2002 buick 3.8 MAF MAP
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No, no, no. Don't spray that stuff in a MAP sensor. These are entirely different sensors that do entirely different things. There is nothing to clean in a MAP sensor and you can only ruin it internally.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dr.donut
User
Oct 20, 2015, 4:03 AM
Post #5 of 20
(1932 views)
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Re: 2002 buick 3.8 MAF MAP
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thank you, something that important should be written on the product.
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 20, 2015, 4:24 AM
Post #6 of 20
(1928 views)
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Re: 2002 buick 3.8 MAF MAP
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MAP sensor probably isn't causing your symptom anyway. I'd say you are going to need to look at factory data stream information to deduce what is going on. Look at misfire current and history counters.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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kev2
Veteran
Oct 20, 2015, 8:05 AM
Post #8 of 20
(1918 views)
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Re: 2002 buick 3.8 MAF MAP
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scan for codes - yes even if cel is off.
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dr.donut
User
Oct 26, 2015, 12:05 PM
Post #9 of 20
(1865 views)
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Re: 2002 buick 3.8 MAF MAP
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I read the codes and there were multiple random misfires po300 ,along with low coolant temp po128 , and small evap leak po442. I can replace the thermostat with OEM that should take care of that. The other two I've little experience with, where should I start?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 26, 2015, 2:18 PM
Post #10 of 20
(1862 views)
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Re: 2002 buick 3.8 MAF MAP
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? Do you already know thermostat isn't the correct rated temp for the car? No sense looking at much of anything till that correct.
Rare side but also a coolant sensor that tells ECM that engine is in fact warmed up not for the gauge or a light and if that thinks it's always too cold it would run like crap all the time,
T
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dr.donut
User
Oct 26, 2015, 2:42 PM
Post #11 of 20
(1858 views)
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Re: 2002 buick 3.8 MAF MAP
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If it is rated correctly then it must be inferior and I'd replace it, if it isn't I'd replace it anyways while the hose if off, what kind of tolerance are we dealing with. Does it send a code if it's off by 5 or 10 degrees f?
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 26, 2015, 3:51 PM
Post #12 of 20
(1856 views)
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Re: 2002 buick 3.8 MAF MAP
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Like I mentioned earlier, your probably going to have to get hold of an enhanced scan tool that can get on the manufacture's side of the PCM to view current and history misfire counters. That will tell you which cylinders are skipping.
Sometime when you have a skip under load, such as during TCC lock up around 45 mph and then accelerating enough not to disengage TCC, it is more than likely an ignition related problem. If the plugs and wires are old or worn out, wouldn't hurt to tune it up to see if your missing issue goes away. Use AC delco plugs and wires.
For the EVAP code inspect the gas cap. Make sure the seal isn't cracked. Gas caps are not too expensive. I recommend getting one from the dealer. If that doesn't take care of the P0442, your going to have to check for leaks using smoke machine or purge seal testing using scan tool.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Oct 26, 2015, 4:00 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 26, 2015, 11:23 PM
Post #13 of 20
(1850 views)
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Re: 2002 buick 3.8 MAF MAP
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Quote from post #11 above re Thermostat's temp rating: ">>If it is rated correctly then it must be inferior and I'd replace it, if it isn't I'd replace it anyways while the hose if off, what kind of tolerance are we dealing with. Does it send a code if it's off by 5 or 10 degrees f?<<"
Whole set up wants expected factory temps so YES if always lower than what should be a "warmed up" temp it may not go in to its closed loop and never get out of it's "grace period" for warming up normally. I asked you if YOU KNEW it was wrong and you didn't answer. It only wants the right one that works.
They sell lower temp t-stats all the time as people request them thinking it will help something - it wont.
That question WAS IF YOU KNEW IT WASN'T THE OE SPEC ONE. No point in any other check if you know it's wrong! IMO 10F is way too wrong - 5F may not. New they aren't quite that perfect but close,
T
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dr.donut
User
Nov 8, 2015, 6:59 AM
Post #14 of 20
(1817 views)
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Re: 2002 buick 3.8 MAF MAP
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I replaced the thermostat with one from napa, he said it was an OEM part rated at 195f, the old one from C Q opened at 190 in a pan of water on the stove using a kitchen thermometer and stayed open at 180, now I have to read and clear codes and more than likely replace the plug wires, Some things take a back seat while priorities are taken care of,can't cover all the bases
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 8, 2015, 8:05 AM
Post #15 of 20
(1813 views)
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Re: 2002 buick 3.8 MAF MAP
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? Mostly about thermostat witnessed staying open at 180F in pan. Did it close ever by itself? Either way if that could stay wide open it would cool engine to as cool as it could below where it would/should know it's ready and warmed up.
Pic if it shows.........
195F rated is correct in my own search. Also saw that a 180F sold more!!!!
Have you looked at a couple spark plugs yet? They could show that they are trashed IMO from too much fuel for too long.
I don't think wires care about this but character of a spark plug could easily. So much as wrong brand or type can cause whacked issues.
IDK - I'd take a look at a couple and check with an known accurate infrared touchless thermo what the temp of the termostat's housing is when you know it should be fully warmed up - it's close to the real rating of an accurate thermostat tested many times by me on assorted vehicles has shown to be a valid test. Trouble is you need to know the thermometer is dependable too and accurate to +/- at least 2F.
This could easily have just cause troubles down the line if it was run long enough while wrong,
T
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dr.donut
User
Nov 8, 2015, 9:36 AM
Post #16 of 20
(1809 views)
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Re: 2002 buick 3.8 MAF MAP
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Plugs are about a year old but I will check their condition to see if any problems may exist, I will check plug wires for more than 10,000 ohms per foot. Also, some engines can be turned forward after removing an upper mount for easier access to rear plugs, is there any such thing for the 3.8 ?
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 8, 2015, 9:57 AM
Post #17 of 20
(1806 views)
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Re: 2002 buick 3.8 MAF MAP
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You don't need to roll the engine on that to access the plugs. Your going way back to the 3.1L T engines that you could roll forward. Ancient history there.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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dr.donut
User
Nov 16, 2015, 2:41 PM
Post #18 of 20
(1789 views)
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Re: 2002 buick 3.8 MAF MAP
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Replaced the plug wires after starting the car and it ran terrible with the check engine flashing,the number 5 wire was passing zero current. it was routed under a clip tight to the valve cover , maybe not a good idea. The gas cap has a thin O-ring that was cracked, peeled it out and used one I had lying around , no codes for almost 200 miles, I'll buy a new cap if I have to but thanks again for the help. Never cleaned that MAF sensor because I didn't have torx bits for the ones with a dimple to remove it.
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dr.donut
User
Dec 5, 2015, 10:33 AM
Post #19 of 20
(1750 views)
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Re: 2002 buick 3.8 MAF MAP
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had to buy the new cap, "balkamp" from napa, topped off the trans fluid and all's good
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 5, 2015, 10:51 AM
Post #20 of 20
(1748 views)
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Re: 2002 buick 3.8 MAF MAP
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Good to read you got it all figured out and repaired.  Thanks for the follow up. Closed as solved. Can be reopened upon request by the OP.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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