84 944 missing real bad /video\

[HELL DRIVER]

what do u guys think? I had the car parked in the garage for over a year now (the car was running fine) without starting it. Last week I finally had time to work on it again. I went to start it and nothing. So I got a new battery and it was cranking but not starting. A couple of times it did a big "pop" through the exhaust. So I went and bought some new sparkplugs. The car started right up. However, its running crappy now for some reason. You can hear it popping really bad through the manifold. A lower idler. It actually looks like oil mixed with gas coming through the mass air flow. It seems like there is no loss in power when i rev the engine. I checked the TPS and I heard the click as soon as i moved the throttle, so i dont think theres anything wrong with the TPS. The firing order is in order and I forgot to mention at the beginning when I got it started, it went right up to 4000 RPMs by itself for about a minute and then it stalled. When I restarted this happened. Once in a while it goes right back up to 4000 RPMs. I went around the block real quick. Again, i did not feel any lossed power when im on the throttle. But i noticed a deceleration problem. it does not decelerate like its supposed to. The RPMs take longer than normal to go down. Can it be my crank and speed reference sensors? Thank you in advance.
Porsche 944 missing real bad - YouTube

[alan6272]

Sounds like you have 2 wires on wrong double check your firing order

[HELL DRIVER]

I am going to double check,but i am almost positive they correct.thanks

[alan6272]

Also just thought of this, any chance water got into the distributor cap.

[Gawernator]

Is the gasoline even good?

[Panzer909]

Obviously something majorly wrong there. So other than the plugs & battery you just changed, nothing was touched in the last year? My car was recently sitting for 6+ months while I changed the belts and motor mounts. It sounded similar to yours at first, and what happened was the vacuum line running from the main AFM tube backed out as I was slightly raising/lowering the engine only by an inch or so.

But since you never touched any of that....pull the TPS assembly anyways and clean/inspect it. Also, clean ALL your electrical grounds. Mine didn't start initially because the grounds got funky from sitting - even thouhg they visually didn't look that bad. What does the cap & rotor look like? And I agree that the gas could be a bit old. Put some new gas in and drive it some more. I remember that my tach was doing some weirdness at first..the AFM door was sticky from not operating for so long. These cars really behave strange if you don't drive them for a while

[HELL DRIVER]

I Am going to buy a new cap and rotor and check the spark plugs cap 0.28 first.the fuel tank had no more then 2 gallons in it,so i added 5 more. Why do you think when the car started it revved up to 4000 rpms by it self. after a minute it stalled. when i restarted it this problem happened. why do u think it looks like oil and gas mixed coming out of the mass air.thank you guys very much.

[Gawernator]

AOS seals probably bad

[Trevorlw]

If you do cap rotor. You might as well replace wires while your in there.

[Gawernator]

Wires go bad from use not necessarily age

[HELL DRIVER]

I had no time yet to work on it.maybe tomorrow .i ill keep u guys posted.thanks guys.

[solex3274]

I had a similar problem after my car sat four months in a cold garage. In my case one of the hoses on the bottom of the intake manifold simply came off and the car would not start. Look at the small s hose on the air regulator valve, they get brittle and crack over the years.

[HELL DRIVER]

Ok guys, new fuel filter,drain old gas, put new gas cleaned fuel filter inside gas tank.new plugs new wires cap rotor.sprayed brake cleaner on to vacuum hoses.no difference on the engine idle. still running like crap.any other suggestion's.

[Tom944]

I would guess that if you have gas coming out of he MAF then at least one intake valve is shut when the injector is firing. This could be because the timing is way off or one or more valves is stuck or damaged.

[HELL DRIVER]

How can the timing be off? I didn't think there was a way to adjust the timing on these cars. I thought the DME adjusts the timing itself, correct me if I'm wrong. Can it be one of the injectors being clogged? Somebody was saying something about doing a screwdriver test on the injectors. How is that done, exactly? If it was a bent valve, wouldn't the car be smoking? I'm gonna make another video. It seems after all those changes that the car is running a bit better, but not too much of a difference. I noticed if the hood is closed that the idle stays at about 12000 RPMs. If I open the hood, the car starts to die off. Does that seem strange or what? I got an open mass air right now with no filter, but I don't think that would be the problem since its been sitting like this for at least 5 years in the garage and I never had a problem. It started fine and ran fine. I really don't know what to say anymore, this just came out of the blue. Like said, last year, I started the car sometime in the Winter time. Ran fine, idle fine, and this year this happens. Thanks guys. I really wanted to get this car back together for this summer. I spent the little time that I have to put it back together and now I have too chase this problem, which is really frustrating. I got a feeling that it's going to have to sit in the garage for another year, it's only been 10 years anyway lol.

[alan6272]

Helldriver, When a car sits for a long time"1year" the fuel turns bad, stail, and then the valves or maybe just one can get stuck, open or part way open. I have seen this many times, even a customer put old gas from a junk car into his daily driver. A few miles down the road it broke down and this was the cause. On our cars they are an interference motor so if a valve stuck because of bad gas then the chance is very good that the valve was hit by the piston there for bending that valve"valves". You need to start with a compression test at the very least.

[HELL DRIVER]

Oh, wow.i was not expecting that,iam going to do the compression test ,and see what happens,ok.what is a good compression number for 84 944 with a 103000 miles. If it is a bent valve,i have a extra head , came off a running 86 944 na ,but be sitting in my garage for years ,what do i have to do to make sure dis don't happen again?have to clean real good but what else. guys thanks, again.

[HELL DRIVER]

I just did the dry compression test and the numbers from 1-4 150 149 150 150. That was with the engine semi cold, had it running for a few secs to show my friend how it ran. I don't know if this helps or not but my foot was off the gas. So what should I try next?? When the car is cold i started it and it races to 4000 rpms itself..then gradually comes down and statrts to misfire and dies off..When i restart it it runs like crap. It seems when the rmps are high at first starting, it doesn't seem to be missing..Any feedback is appreciated? Should i try reference sensor or crank sensor.thanks

[alan6272]

I just rewatched your video, it sure sounds like it is fireing at the wrong time or maybe a valve or two is stuck. However your compression test looks good. I have found a good compression motor but it still had a closed exaust valve. This will allow air to enter the intake valve but then exit the intake next stroke. This could give you compression and the sound I hear in the video. I would next pull the valve cover off and take a look. The popping in the intake would be a result. The high idle?? Maybe cause the mass flow is being confused?? I don't know yet.

[HELL DRIVER]

thanks,i am going to post one other video,the car runs a little better after hall the changes.the miss firing true the manifold is practically gone,only wend the car is about to stall it back fires true the manifold at little .but still running rough,not as bad..going to double check the vacuums lines.I hope i don't have to go to a valve cover teardown . .my friend is more of a mechanic incline then i am ,he is telling me it sounds like vacuum leak .thanks again.