nbuyabis

Hi Guys,

Received Fault 21 - HOT FILM MAF, intermittent, present, Short to B+.
Is that a BAD MAF ? or can i start checking other things like DME etc.

Your help is much appreciated

Br,

Najeeb
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'95 993

BobbyT

Hi Najeeb,

You could try just cleaning it first to see if that clears it up. Cheap and easy, just get a can of MAF cleaner from your local parts store, remove the air filter, and give a good squirt of the cleaner into the MAF. Let it dry and repeat several times.

Replace the air filter, start the car and drive it some to see if the problem clears up.

Barney1

Just did that to mine and it works fine.

nbuyabis

Hi Guys,

Changed the air filter. cleaned the MAF with air sensor cleaner.
The Idle seems to be fine. However, it seems to be getting wrong data from the ECU??

could Fault ECTS 2 causing some sort of error? or i can conclude that i have a dead MAF?

Thanks for your help

Najeeb
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'95 993

geolab

Najeeb, kifak?
keap one post for your problems, and we can react on it. There are several posts, and I did not know where to answer.
The more you give us details, and gather in one post, the better we can answer.

You explained on another post that your intake blew up.
if this is the case, you will have plenty of error codes stored.
you have to put everything back together, clear the errors , go from there.

if intake blew up, I think this is electrical at 95%
piston compressing fuel/air mixture, and the fuel was sparked before TDC

Electrical
Three things do that:
First is ignition switch is dead. (under driver seat) giving crazy spark orders
Second, broken distributor belt
third, electrical harness in kuwait

Mechanical 5%
your catalytic converter might have burnt the cartridges.
the honeycomb becomes rock hard and clogs when cold
it is like starting engine with clogged exhaust.
but in my trivial logic, this cannot pop off the intake
the engine will go backward half a stroke only

conclusion:
check distributor belt, easy diy cost zero
second: ignition switch is $70ish you can change it.
third check harness recall, porsche does it for free

nbuyabis

ahlain Geolab,

First i apologize for the multiple posts. These gremlins are frustrating me and the weather is getting really nice here .

I placed everything back together- the intakes and all. I found the the rotor misfiring on 3 cylinders. The pole that the rotor fits one was bent to one side and apparently when the car starts the rotor wiggles inside thus skipping the firing order. Fixed it and replaced the cap and rotor.

Now, the car starts fine. When driven, however,i do hear "phut phut " and a deep throaty sound (at idle) signaling something is not right!
so i took it to dealership and had them run a obd scan on the car. They came up with a couple of fault codes and they are :

21 - Hot Film MAF - short to B+
16- Throttle position Sensor - open circ/short to +
27 - IACV Opening winding - op circ/ground short
28 - IACV Opening winding - op circ/ground short
14 - ECTS 2 - signal implausible.

The dealership here is the worst you can ever find. Also, the cat has been removed. The harness was changed years ago when i was in the US i believe. Hope this makes sense and i appologize again for the multiple posts.

Thx.

Najeeb

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95 993

Steve Weiner-Rennsport Systems

Najeeb,

Some suggestions for you:

1) Check the connectors VERY carefully. Oxidation/corrosion is the cause of many such issues and make sure everything is clean and shiny. Confirm continuity.

2) Check the connector on the throttle position switch; same issues.

3) Replace Idle Stabilizer if its connector shows ground shorts; they don't last all that long.

4) Make certain the belt inside the distributor is intact and the connector on the side of the unit has continuity.

nbuyabis

Hi Steve,

I verified that the dist belt is intact and working properly.
When i start the car, the idle begins at approx 1100 mark after 3-4 minutes it drops very low, as if the car is going to die.

While the car is running, i unplugged the connector from the ISV - the RPM increased ( Is it fine?)

Also, for the ECTS 2 error, i have replace it with a new one thinking that this might be one of the culprit.

should i spray the connectors with contact cleaner? Also how can i test if the MAF is working properly? I cleaned it, however, i still get the "phut phut"

Thanks 4 ur help

Najeeb
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'95 993