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Time for a fuel head rebuild ?? Anybody with EFI have a spare one I can borrow ??
T
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"Todd"
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91 Spec Miata (yeah I race a chick car)
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Old 11-28-2009, 04:15 PM
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Quote:
Originally Posted by 9dreizig View Post
Ok cute blonde just came over,, started it up control pressure slowly climbed into the 2's had her bleep it to 3000 rpm control pressure didn't blink but the AFR's went to 10 and change..

Mooney, does this point to the plunger in the fuel head ??
Well, that all depends on just how "cute" the blonde is??? Actually, what it does show is the WUR seems to be working correctly...

I'm not too sure what it points too... There are more much qualified persons around here who can answer that one... sorry
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Old 11-28-2009, 05:12 PM
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Anybody else have any ideas? Fuel head ?? Should I try to re-build it or spend the $500 on a newly rebuilt one ? Anybody have a spare ?
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91 Spec Miata (yeah I race a chick car)
"life"ll kill ya" Warren Zevon
Old 11-29-2009, 08:47 AM
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If you rebuilt the recirculation valve, the fuel head should present no problem for you as long as you can find a rebuild kit.

Before I would do that tho' I would run a can of Techroline or Sea Foam through the fuel system. It can be remarkable what that stuff can do. And the cost is miniscule compared to rebuilding or replacing the fuel head.

Good Luck,
Mark
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Old 11-29-2009, 08:56 AM
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Thanks Mark, I've done a little more reading and some guys are talking about just concentrating on the plunger.. maybe a partial rebuild ?
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"Todd"
98 Tahoe ,2007 Saturn Vue
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91 Spec Miata (yeah I race a chick car)
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Old 11-29-2009, 09:02 AM
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Todd, you may want to peruse this:
CIS fuel distributer cleanout w/pics

I rebuilt on of my SC heads to try and get some more oomph out of it (IA did the other head I use)
Pat
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Old 11-29-2009, 09:51 AM
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I too think this may be the piston which is why I asked if the AFRs would recover if the trottle was left at 4000rpm sustained. This would indicate a slow or sticking piston.

You might remove the head and bathe the piston in carb cleaner then wipe down with a soft cloth.

Sorry I didn't get your call, the cell phone is sitting on the dresser and we've had company all weekend.
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Old 11-29-2009, 10:56 AM
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Brian, one more tidbit of info.. I did notice last time I drove it, I seemed to get much better AFRs running in 3rd at 3300 rpm than 4th at 2000 something RPM.. and AFR's seem to be a slow recovery rather than a quick one.
Now to figure out how to remove just the plunger..
Gotta do some traveling and them move at the end of the month so may be a while before I can jump into this again.
T
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Old 11-29-2009, 11:02 AM
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Pat , great thread,, scared the hell out of me!!
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"Todd"
98 Tahoe ,2007 Saturn Vue
86 930 black and stock, 80 930 blue tracdog
91 Spec Miata (yeah I race a chick car)
"life"ll kill ya" Warren Zevon
Old 11-29-2009, 11:12 AM
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Hey guys I took my fuel head into Fuel Injection Corporation in Livermore today. They put it on the test stand and it's perfect!!! Back to the drawing board!!! Will put it back on Friday or Sat and I'm sure will need your help..
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91 Spec Miata (yeah I race a chick car)
"life"ll kill ya" Warren Zevon
Old 03-30-2010, 06:47 PM
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hey Brian I"m going to get involved in this again.. tired of not driving my car.. So am reviving this thread,, gonna start from scratch..
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"Todd"
98 Tahoe ,2007 Saturn Vue
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91 Spec Miata (yeah I race a chick car)
"life"ll kill ya" Warren Zevon
Old 07-16-2018, 03:37 PM
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you have contradicting info.

you say the CP is 4.8 but when the blonde started the car it climbed to the upper 2's???

put the stock WUR back on if it is not.
check your system pressure per what brain said in post 2 I think it was.
check your CCP then WCP.
set the WCP to spec, I think it is 3.9(?).
adjust your mixture for 14.5 idle.

its not s sticking plunger. it would be rich at idle and lean driving if it was stuck in the "up" position and if it was stuck at "idle" you would be lean at cruise.

check your AFR's at steady driving. check it at 2k and 3k or just 3k.
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Old 07-17-2018, 04:00 AM
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there should not be any pressure on the return side. in fact you should be able to blow through the line.

I would look at system pressure.
are both fuel pumps running.
check the fuel volume OUT of the fuel head. 1500cc per 30 seconds.
also check fuel volume out of FD to the WUR. 220cc per min.

I know you said you checked for air leaks but an air on the pressure side WILL make it run richer at cruise.
is your BOV vent to atmosphere or is it recirculating
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 07-17-2018, 04:05 AM
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wait, do you have an aluminum head or cast iron? CP for euro is 3.65

remove the vacuum hose to the WUR and plug it. test it that way. stay off boost
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 07-17-2018, 04:08 AM
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Ok guys here's an update with a bit more info...

WUR is stock 1986 It has always run a bit rich but got worse when I moved to Reno (4400 ft altitude) and even more now that I live at 6800ft altitude.
I re-ran the pressure tests. Results are 2.8 cold 3.8 warm and system of 6.8 bar.

Also looked at AFR again and at 4000 rpm no load in the low 10s..

Brian mentioned that there is no alt. comp on this year WUR but still ??

I'm at wits end here guys. what next? The FD was checked out a while ago and no problem.. How would I go about bumping the pressures? Would an adjustable WUR be able to fix this??
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Old 07-25-2018, 12:58 PM
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you have one pic with a euro FD and one with an aluminum head, which one do you have

are you certain the AFR's are in the 10's. can you trust your sensor.

where is the bottom vacuum port on the WUR connected to. it should be on the T connector on the back of the TB.

remove the vac hose to the WUR and plug it and test the AFR again.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 07-26-2018, 05:47 AM
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Air leaks?
Edit - thinking on, should be lean off boost, and rich on boost with airleaks. So something else I think. Sorry.
Alan
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Last edited by Alan L; 07-26-2018 at 02:39 PM..
Old 07-26-2018, 02:33 PM
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Ok here's an update. I ordered a smoke machine (always wanted one) scheduled for delivery today.
Any ideas as to where to hook it up to check for Vacuum leaks ?
Oh and T77911S I have an aluminum FH, I also tried pulling the vacuum hose off the WUR and no change at all.
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"Todd"
98 Tahoe ,2007 Saturn Vue
86 930 black and stock, 80 930 blue tracdog
91 Spec Miata (yeah I race a chick car)
"life"ll kill ya" Warren Zevon
Old 08-01-2018, 11:22 AM
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And another update.. got the smoke machine (very cool tool to have BTW!!) fired it up and NO LEAKS!!! I'm stuck now suggestions ?
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"Todd"
98 Tahoe ,2007 Saturn Vue
86 930 black and stock, 80 930 blue tracdog
91 Spec Miata (yeah I race a chick car)
"life"ll kill ya" Warren Zevon
Old 08-01-2018, 04:20 PM
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the side port on the WUR is connected to the T on the back of the TB, correct?

you say you can rev the engine to 3k and it goes rich, have you monitored the CP's while doing this?
if the CP does NOT change then I would say a bad head. if the CP is changing you need to figure out why.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 08-02-2018, 04:01 AM
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