MAF yes or no answers !!!

88_S10 · 10-17-2006, 04:18 PM

Hey all just a question..... Does a 88 S10 2.8 L V6 have a MAF???? All I need to know is YES or NO. I am

over this Damn Truck of mine !!!!

maxwedge · 10-17-2006, 06:04 PM

Map sensor with the TBI.

88_S10 · 10-17-2006, 07:12 PM

THanks for the response, however it is not a MAP Sensor I am looking for, it is a MAF - The code is 34 and it could be Signal High-Flow Low. the other possibbility for code 34 is the MAP Sensor Voltage High - Pressure High/ Vacuum Low

Blue Bowtie · 10-17-2006, 09:47 PM

Since your truck doesn't have a MAF, you can stop looking and solve the "34" for the MAP instead.

Blue Bowtie · 10-17-2006, 11:13 PM

Quote:

Originally Posted by 88_S10

It wants to conk out on me when I come to a complete stop and then proceed. it is also hard to start and stay started. Any other suggestions? think my Computer might be screwed??? I am lost and now pretty broke.

Make sure the reference voltage at the MAP is correct. You should read 5.0VDC across the outer two terminals. That comes directly from the ECM regulated supply. Chanced are that it's O.K., and the MAP is actually detecting a low vacuum condition. Connecting a vacuum gauge would confirm that.

Make sure the vacuum source is connected to the MAP securely. The lack of adequate vacuum could also be related to the EGR problem you posted in this thread:

http://www.automotiveforums.com/vbul...d.php?t=611855

If the EGR valve leaks, vacuum will be very low, starting will be difficult, and idle quality will be terrible, if it will idle at all. Remove the EGR valve and inspect the pintle and seat. There will likely be carbon encrusted there, and you should scrape/clean it out as best you can to make sure the valve seals properly.

silicon212 · 10-17-2006, 11:55 PM

I have to agree with Blue Bowtie - the whole thing smacks of a vacuum leak and you will need to get that taken care of before trying to fix something else. As stated in the other thread about the EGR failure, the problem could either be the valve (carbon or a bad diaphragm) or a leaky gasket. A vacuum leak here will:

cause EGR fault in ECM (Code 32)
supply insufficient vacuum for proper operation of the induction system (MAP, code 34)
lean out air/fuel mixture (Code 44)

and cause it to run rough and painful, and stall a lot.

88_S10 · 10-18-2006, 08:00 AM

Ok, as of yesterday, I got the EGR Valve and EGR Gasket replaced and the air intake cleaned. What should I do next? I do not know how to test much of anything. When I bring it back to a garage what should I get them to look at or do????? I really appreciate all your help

Blue Bowtie · 10-20-2006, 11:19 PM

Test idle vacuum. No need to pay a mechanic for that - Just get a vacuum gauge. If it's below 16" Hg with a mostly stock engine (stock cam) start hunting for a vacuum leak. If the idle vacuum is more like 17" Hg, any leakage you might have is probably not the root cause of the problem.

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