Map sensor removal 2.8l

KJCRDNJ · **Joined:** Sat Oct 09, 2010 10:24 am **Posts:** 9

Hello,
This is my first time removing the MAP sensor.
I saw the previous posts and pictures which were great.
I found the sensor no problem but can not figure out if that is a torx socket to remove the bolt or what?
Does anyone know what type of socket is used to remove this bolt?

Thanks appreciate the help!

Scott

StanCRD · **Posted:** Sat May 07, 2011 12:19 pm

4mm hex is what you need

warp2diesel · **Posted:** Sat May 07, 2011 12:27 pm

I remember it being a metric Allen.
Unlike 15 to 20 years ago, quality Allen drives and Torques are not hard to find anymore.
Besides SnapOn and Mac, Autozone, Advance, O'Reilly, Lowe's, Home Depot, Menards, ACE, True Value, Canadian Tire, other good Hardware Stores, and all the places who now sell Craftsman, have Quality Allen and Torques drives. Even Harbor Freight has upped their quality so theirs don't break. For the big industrial stuff that use larger Allen and Torques drives (that are not used on our CRDs), I order from McMaster Carr.
Buying a set of both metric Allen and Torques drives that fit a 3/8" ratchet would be a good investment that would pay for its' self on the cleaning the MAP sensor alone.
To keep the inside of the Allen Head Cap Screw used to hold in the MAP from rounding off:
1) Use the proper metric size.
2) Clean out all the dirt and debris with a pointed tool.
3) Tap the top of the metric Allen drive with a small hammer to make sure the Allen is all the ay in and to jar the threads a little to make sure they break loose. This trick is what mechanics use to break thread locker so they don't twist the Socket Head Cap Screw off in the casting.
Now you know.
I have other tricks to get out screwed up Allen bolts, if you need to know.

KJCRDNJ · **Joined:** Sat Oct 09, 2010 10:24 am **Posts:** 9

Yes it was a 4mm hex worked like a charm.
I throughly cleaned it but I still have a check engine light.
I will have to check the EGR valve next weekend as the lawn awaits a cutting.

Thanks for the replies!

Scott

geordi · **Posted:** Sat May 07, 2011 2:17 pm

The idiot light will clear after 3 start cycles, if it was the map causing the code. It will take a scantool to completely clear it from the computer. If your EGR is bad, I have 2 available, as I have an SEGR and a GDE tune making my EGRs never used.

beetlemn73 · **Posted:** Thu May 12, 2011 8:31 pm

I'd like to continue on the MAP sensor discussion. I replaced mine today. I've been throwing a LOW TURBO BOOST code. Been through all the pressure hoses. Took a look at the ACV valve.(by the egr inlet) 1st question. The sensor I took out is a Bosch 0 281 002 845. The replacement I installed is a 0 281 002 437. Any ideas if the are equivalent? If I have the MAF sensor disconnected(ORM), would that interfere with the turbo boost? I'm going to drive it 20 miles tomorrow and see if the MAP sensor corrects the low boost condition.

Sir Sam · **Posted:** Thu May 12, 2011 9:03 pm

You said you went through the boost hoses. Did you physically remove them and inspect them for tears or leaks?

If you had a boost gauge it would be interesting to see what your pressure was.

The other possibility for low boost would be a leaky intercooler. You would need to pressure test it to figure that out.

beetlemn73 · **Posted:** Fri May 13, 2011 4:31 pm

Yes, I removed both the upper and lower hoses. Lower had a heavy film of oil inside. Upper not as bad. I did the mouth suction test on the turbo actuator and it seems to hold a vacuum. I thought I had it pinned down that when it was cold it was sluggish and when warm...boy, the throttle would have excellent response. But that does not seem to be true all the time. 67k on the motor.
I thought of the intercooler. I guess I could hook up a shop vac to that and listen for leaks.

beetlemn73 · **Posted:** Sun May 15, 2011 8:06 pm

I am going to answer my question. I found out that the Liberty uses a VVT or AVT type turbo. With all the EGR soot and CCV oil that has accumulated over the years, the variable vanes have been coated with the black goo. So, to bring to the dealer is a $2500 bill because they can not justify the removal and clean cost. So my next question is, how hard is it to remove the turbo?

Map sensor removal 2.8l

Who is online