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Car Forum / Porsche / Porshe 944 / July 2007time for a tune up?
I have an 86 944 with 124k. Runs nice and smooth but idles maybe a tad rough at times, but not too bad. I was driving a friends 84 944 the other day and noticed that his car had a lot more power in the lower rev range, below 4000. If you rolled on the throttle around 2-3,000 rpm it really pulled strong, where mine has almost no pull at the same speed. It starts to pull harder as it should around 4000rpm but loses its urge completely around 5500 and doesn't really want to pull up to the redline. I know the previous owner installed new plugs in 2002 before i bought it (at 95k) but I think the plug wires/rotor/distributor might be original. The wires look to be cracked and brittle. I just replaced the air and fuel filters. Is my performance likely lacking due to old ignition equipment, or could I also be looking at dirty injectors among other things? I'm especially interested in why my engine doesn't pull strong at lower revs compared to other 944s? Thanks! I would have thought that you will need new plugs by now. Alec >I have an 86 944 with 124k. Runs nice and smooth but idles maybe a tad >rough at times, but not too bad. I was driving a friends 84 944 the other [quoted text clipped - 13 lines] > > Thanks! 1. ignition wires, cap, rotor need to be changed about once per decade - you are due, change them. Use the OEM ones. 2. injector cleaner won't hurt, try it 3. plugs probably need to be changed - the manual has a recommended interval - follow it 4. the AFM could be bad, but that usually shows up as a dead spot 5. check for vacuum leaks, your car is very sensitive to vac leaks (and to clogged air filter) >I would have thought that you will need new plugs by now. > [quoted text clipped - 17 lines] >> >> Thanks!  SignaturePosted via a free Usenet account from http://www.teranews.com Also lift the bonnet (hood?) in the dark and see if you can see any flashes from the ignition wiring. Alec >I have an 86 944 with 124k. Runs nice and smooth but idles maybe a tad >rough at times, but not too bad. I was driving a friends 84 944 the other [quoted text clipped - 13 lines] > > Thanks! You may have low fuel pressure along with poor spark. > You may have low fuel pressure along with poor spark. I thought of that but the car has a new fuel pump. I know people who have had their injectors taken off and professionally cleaned and are amazed and the difference....would that be worth a shot or throwing money away? I've run chevron many times with no difference. what is your level of mechanical competence? I'm not being rude here - a new fuel pump has little to do with proper fuel pressure - that is controlled by the fuel pressure regulator (and secondarily by the damper), which in turn are controlled by engine vacuum. You find out if you have the proper pressure by using a gauge to measure it, not by replacing something and declaring it fixed. you can clean injectors yourself, I've done it - just use carb cleaner - but if you aren't much of a mechanic, you are likely to cause more trouble than you fix. Instead of shotgunning a problem, some care spent in dianostics will not only save you $$, but will get the problem fixed (usually) --- of course some problems are really really hard, but your's doesn't sound like such a problem >> You may have low fuel pressure along with poor spark. > [quoted text clipped - 3 lines] > cleaned and are amazed and the difference....would that be worth a shot or > throwing money away? I've run chevron many times with no difference. SignaturePosted via a free Usenet account from http://www.teranews.com > I have an 86 944 with 124k. Runs nice and smooth but idles maybe a tad > rough at times, but not too bad. I was driving a friends 84 944 the other > day and noticed that his car had a lot more power in the lower rev range, > below 4000. If you rolled on the throttle around 2-3,000 rpm it really > pulled strong, where mine has almost no pull at the same speed. It starts > to pull harder as it should around 4000rpm My previous post seemed to have vanished into the ether, so apologies if this is a double. Seems that others have already addressed your low end power issues. > but loses its urge completely > around 5500 and doesn't really want to pull up to the redline. For any non-16 valve and non-turbo 944, lack of breath at around 5,500 rpm is "normal." That's why Porsche produced 16-valve and turbo 944s - to improve breathing and get useful power in the rpm range. speaking of 16 valve engines - anyone want one? I have one for sale, I'm about to part it out >> I have an 86 944 with 124k. Runs nice and smooth but idles maybe a tad >> rough at times, but not too bad. I was driving a friends 84 944 the [quoted text clipped - 15 lines] > rpm is "normal." That's why Porsche produced 16-valve and turbo 944s > - to improve breathing and get useful power in the rpm range. SignaturePosted via a free Usenet account from http://www.teranews.com |
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