[urq] I'm SO close to giving up...Anyone have a stick of TNT !!

[Andrew B]

Here's a suggestion:
I had the exact same thing happen to me on the highway.  My car has
been burning coolant, presumably from a warped head or blown gasket. 
Anyways, the car would start to stumble at above 3500rpm, or full
boost.  It felt like one cylinder was not firing.  I figured it was
due to a leak in the junction between head and block, with gases
escaping, but Chris at force5 suggested that it might be coolant
killing the spark.  That sounds pretty realistic to me, but I can't be
sure.

Maybe the same thing is happening with yours...a small crack in the
head or a bad gasket?  I would think it would show up in a compression
test, but it might be worth it to take a look inside and see what you
find.

-A

On 4/15/05, Chaplen, John <John.Chaplen at mercer.com> wrote:
> Ok....basic problem...Under "WOT" and boost the car stumbles...back off
> the throttle just a TAD and car starts pulling strong again...
> 
> What's been done...(not necessarily in this order)
> 
> 1 New fuel injectors - all lines checked and cleaned
> 2 fuel Dist checked, but rebuild anyways (with increased flow) - all
> retested..seems no problem with flow.
> 3 Volume test done - Ok'd
> 4 Pressure test done - Ok'd
> 5 Back flow from Exhaust - NP there
> 6 Checked for the small filter ...no problem there
> 7 checked WOT and IDLE switch..all fine there
> 8 new cap, rotor, spark plugs and wires...
> 9 Volt at coil is 13-14 volts
> 10 all grounds clean and tested
> 11 Compression check + - 10psi between all 5 cyl
> 12 Pulled all 5 plugs, they all look fine, no damage, they all look the
> same too...clean and right color...(bosch tri-electrodes)
> 13 Swapped ECU with known good one...still same problem
> 14 checked Waste gate for torn diaphragm - no problem there
> 15 New fuel filters (twice)
> 16 Boost is NOT passing 14 psi (chipped by SJM)
> 17 checked all hoses and removed them, they are fine.
> 18 I have backed boost down to less than 9psi still same symptoms
> 19 removed full throttle cable (thinking it might be a full throttle
> mode) nope..
> 20 new and checked the Freq valve for duty cycle looks correct and can
> hear it working
> 21 rebuilt alternator to make sure voltage/amps were not a problem
> 21 car passes DEQ SUPER clean...
> 
> I guess my last question would be that I can think of, are there any
> sensors that might be bad that would put the car into a reduced timing
> mode?
> 
> I have had Scott Mockery drive the car, and it's NOT a fuel cut out
> issue (4K cut out).
> 
> I just installed a fuel air meter box Wednesday, but have not had a
> chance to run it...but from tests at idle with running WOT switch, it is
> fully enriching as it should do...
> and running and idle it's stoich? (sp)...I will be trying to drive it
> this weekend to see if it's running too lean...But to me at this point I
> feel like it's a timing issue?
> 
> (NOTE- I have done all of the above to try to fix this problem)
> 
> Any help would be so much appreciated!!!
> 
> John Chaplen CNE
> Mercer Human Resource Consulting
> Portland, OR 97204-3693
> 
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