I just purchased a 86 928s with a 5.0...car runs but burns rich...Same issue as others irratic idle, hard to start at times...sometimes it starts with very low idle..lots of power,.please help.thanks

125

Asked by MTA1968 Apr 16, 2013 at 04:16 AM about the 1986 Porsche 928 S Hatchback

Question type: General

Please help me in what could be the issue....I know
about Fords and Mopars not Porshe...I love this car
and want to fix it plus keep it...but I need help before I
change my mind and sell it....Thanks

14 Answers

Needs diagnostic. The '86 Porsche 928 has OBDII you can get it scanned free then bring the codes back here for one of us to discuss and help you decide what to do, or go to http://repairinfo.alldatadiy.com/Porsche-928-1986-OBD_II_Codes_H2t84.php ...might consider not selling it (yet) may be minor

5 people found this helpful.
Best Answer Mark helpful

geez i went looking for diagnostic scanners for the 928 to say maybe buy your own but at http://www.summitracing.com/parts/otc-3825j/overview/year/1986/make/porsche/model/928 they have a nice one....for $5,500 so maybe not.....

4 people found this helpful.
125

Thank You..no check engine displayed on dash when engine runs the way it does...

Yeah. these days the Check Engine will light up from such a multitude of things, some cars mileage alone...in 1986 not so much. But it could be something like an 02 sensor ..that could make it run rich. Lots of mechanics like to jump to conclusions about the 02. sensor which is possible but just one of many things. The only other problem you may run in to is the 928 was discontinued in 1995 so parts may not be as available as some later Porsche's. But it is FINE car and there are plenty of aftermarket parts.

2 people found this helpful.
125

Thanks again..if you come up with anything solutions, please let me know.let us all know lol..

Can do. There are not many new questions coming in at 2:30am so I will take some time and look around. I've had enough of the Google Earth Flight Simulator for a while anyway. See if I can find some owners ~~enthusiasts forums.

1 people found this helpful.

http://autoforum.classifieds1000.com/Porsche-928/Thinking_Of_Purchasing_a_928_Beware

1 people found this helpful.

http://www.google.com/search?q=porsche+928+reliability&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:unofficial&client=firefox-a ...a long list of stuff if you feel like reading up on the 928, conflicting owners opinions, some say it's a real piece of crap and others (more than the former) love it

2 people found this helpful.
125

If I dis-connect the mass airflow sensor, could that be part of my problem if the motor smooths out....but then it goes into limp mode right...

I did find another thread at: http://forums.rennlist.com/rennforums/928-forum/616153-maf-voltage-idle.html..and this supposedly is the MAF from this car, first the car

1 people found this helpful.

Now they are expensive..like $250. But they can be cleaned, and if you have a multi meter you can teat the voltage at idle, that site I put up shows what voltage it should show. I'd rather not say a voltage because I don't know only what I saw there and could be wrong ..so I do not want to lead you in the wrong direction. But I do know that after cleaning it some people have had theirs work like new.

2 people found this helpful.

I forgot all about your question, geez, sorry 'bout that. It may or may not go in to 'limp mode' my guess is it would not. http://www.ehow.com/info_12199368_mean-car-goes-limp-mode.html ..explains a lot about limp mode.

2 people found this helpful.

Your Answer:

928

Looking for a Used 928 in your area?

CarGurus has 3 nationwide 928 listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    Michael Griffin
    Reputation
    140
  • #2
    MTA1968
    Reputation
    120
  • #2
    Digby Paape
    Reputation
    120
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Porsche 911
24 Great Deals out of 338 listings starting at $21,888
Used Porsche 944
2 listings
Used Porsche 924
1 listing
Used Chevrolet Corvette
26 Great Deals out of 1,077 listings starting at $15,000
Used Ford F-150
311 Great Deals out of 13,584 listings starting at $1,712

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.