924Board.org

midohioweld · Joined: 23 Jan 2010 Posts: 10 Location: Lexington Ohio

Hello all first time posting here.I have been reading and studying on here for about two months now,great info and help thank you so much.My buddy and I have aquired a pair of 1980 924 turbo cars.We are both going in different directions with them.I am opting to do the LT1 swap as my motor had timing belt broken and valves bent.This project is going well and should be finishing up in a matter of a couple weeks.As for my buddy he is staying true to his car and bringing it back to original.That being said his car had set for probably 10 years.Ihave read the ressurection post and was able to get her running after a lot of cleaning and more cleaning.So far we have changed primary fuel pump with Walbro changed cis distributor with known working unit off my car.Replaced the elbow hose in front of turbo checked rest with carb cleaner.Replaced O2 and frequ valve off other car.Problem is it will start sometimes hard cold better warm and idle fairly well as soon as you give it throttle it will puke out.If I crack the fuel fitting from frequ valve it will idle better and will rev to around 4000 but wont take wot.Any suggestions or help would be great as my buddy did the footwork to get these cars and I really would like to get his running before mine.Thanks again and God bless.
_________________
God gives us all talents it is up to us how we use them!!

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

If you are sure there are no vacuum leaks anywhere, your next diagnositc step should be to check your system and control pressures. At this point, I am willing to virtually guarantee the WUR, if original to the car, is bad.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

midohioweld · Joined: 23 Jan 2010 Posts: 10 Location: Lexington Ohio

WUR is also known as thermo time switch located at rear of intake against firewall???I have changed it out with other from running car no change.I am considering changing all vac hoses to be safe even though I used 4 cans of carb cleaner checking could still have leak maybe.I checked O2 output and it is ok also continuity to frequ valve ok voltage also present@ frequ valve but no ticking is heard as I have read at other posts.Also if I bleed off fuel pressure where frequ valve goes into lower part of distributor it will rev momentarily.Makes me think frequ valve is not doing its job thus not lowering pressure on bottom of dist diaghram and supplying fuel to injectors.Which would cause problem pulling cis plate down making it seem like a vac leak.Am I on the right track of thinking here?Also to check WUR I should look for voltage at cold start valve for approximatly 10 seconds then none to double check function...correct??
_________________
God gives us all talents it is up to us how we use them!!

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

No, the WUR is the Warm Up Regulator, a.k.a. primary pressure regulator, and is mounted on the back side of the intake manifold under the cold start valve.

You should have one of these for proper diagnosis, which you can purchase from me, or from JC Whitney:

Smoothie · Posted: Mon Jan 25, 2010 10:44 am Post subject:

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Quite right, Smoothie, my oops

_________________
erstwhile owner of just about every 924 variant ever made

bnoon · Posted: Tue Jan 26, 2010 8:19 am Post subject:

For sure get the tester mentioned by ideola, you will save more than the cost of the tool just by using it to correctly diagnose the correct part on the car. CIS parts are too spendy to just "think" you have a bad <insert part name here> to end up replacing the wrong one.
_________________
'80 924 Turbo - SOLD!
1986 Porsche 944 Turbo - SOLD!
Porscheless

924OZY · Posted: Fri Jan 29, 2010 12:30 am Post subject:

It could be a collasped muffler, or some other obstruction in the exhaust.
I had a similar problem, was real slow to rev over 4000rpm,
took so long to build revs it was boring,
just got a 2.5" with an offset straight through muffler, and it's heaps better. Especially from 4000 - 6000.

I would go 3" on a Turbo.

_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

dvalmont136 · Joined: 18 Sep 2008 Posts: 98 Location: Columbus, OH

midohioweld · Joined: 23 Jan 2010 Posts: 10 Location: Lexington Ohio

Well got some fuel pressures today all no running.Pressure with valve closed was approx 30 psi with valve open 21psi so... with the system pressure being so low I started to investigate why.Outer fuel pump running unsure at this time if in tank pump is running.No high amp pull on pumps outer is walbro 255 which is new.Pressure at incoming line at fuel filter was only 30psi and by making pump run continiuos was able to get almost 40psi.From what i have studied thas is about half what I should have?It should be 65 to 85 psi...correct?This being the case possible plugged accumulator or in tank pump.Well thats where I am at now going to look around here and see if I can find a similar post on this.Thanks for all your help people this board is great!!John
_________________
God gives us all talents it is up to us how we use them!!

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

midohioweld · Joined: 23 Jan 2010 Posts: 10 Location: Lexington Ohio

The WAlbro gsl392 fuel pump is a high pressure high flow unit capable of over 100 psi.http://www.inlinefuelpumps.com/images/gsl392-psi.jpg This shows the flow rates it shoud be more than capable.I just don't know where I am losing the pressure.Took pressure @ fuel line before filter so I assume it has to be a restriction or fuel pickup problem.Suppose it could be faulty pump even though new but no high amp pull on it.
_________________
God gives us all talents it is up to us how we use them!!

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Hmm, a quick spin around the Net seems to indicate the Walbro is CIS friendly. The accumulator shouldn't clog. . .might be time to drain the tank and check the intake screen on the intank pump.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

midohioweld · Joined: 23 Jan 2010 Posts: 10 Location: Lexington Ohio

Yes that is on the agenda for morning have it ready to go up on the rack first thing...was going to do today but had to work on the daughters Kia...now there is a real surprise.Lol will post what I find tomorrow!John
_________________
God gives us all talents it is up to us how we use them!!

midohioweld · Joined: 23 Jan 2010 Posts: 10 Location: Lexington Ohio

Well finally got to look at porsche today...in tank filter was plugged cleaned tank and filter yet again.I now have approx 85 psi system pressure but when I check WUR pressure it stays the same.Valve closed or open no change plugged in or not no change.Suppose it would need a new WUR .Please holler back and let me know what you think or if there might be something else I might be missing.Thanks John
_________________
God gives us all talents it is up to us how we use them!!