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PostPosted: Tue Feb 05, 2013 8:27 am 
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Timing belt was checked few times along with many other things like crank pulley ect. It is set correctly.
Yes - engine passes 5500rpm without problem when there is no engine load.

As I rememeber also AFR was fine and the problem still occured (we've checked also different AFR settings)

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PostPosted: Tue Feb 05, 2013 12:37 pm 
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This may sound stupid, but could it be the gearbox?

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PostPosted: Tue Feb 05, 2013 1:03 pm 
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PBC137 wrote:
This may sound stupid, but could it be the gearbox?


It can't because sometimes engine goes above 5500rpm - engine would literally destroy gearbox when something for example would stuck inside.

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PostPosted: Wed Feb 06, 2013 11:32 pm 
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When i get to 5500rpm and the problem occurs and I hold engine like that for about 1 seccond than right after that I have fuel explosion in exhaust so I suppose the problem is with ignition (but every part was already swapped to new one).
I have piggy back connected (now disconnected) to ignition and MAF - perhaps something with cabling over there isn't quite right??

I'm clueless :/

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PostPosted: Thu Feb 07, 2013 9:29 pm 
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UPDATE 2:
I don't know why but power distributor "finger" under distributor cap was loose, and ignition was about 0 although it was set to be max advanced and I can;t advance it more - only was is by adjustable cam gears which I have installed but set to zero. Now I thing I should advance intake camshaft but as I recall after doing that power drops dramatically - after advancing intake camshaft by about 4 deg as I remember max power dropper from 131hp to about 110hp :/[/quote]

I was looking through your posts, this post must be a clue! Something here has happened. The ignition must be miss aligned. In distributor, cam gears, belt? It really is a ignition problem. When we work on something so long we miss things. You should not have to advance distributor than much - it is a hint

You said you were using a piggy back as well. Get it out of picture for awhile. What does in control?

You may need to check distributor pickup alinement with TDC of piston and cam to confirm something. It's hard to discernible in email.

....

Then again you need to check for spark at load like I mentioned before.

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PostPosted: Fri Feb 08, 2013 3:57 pm 
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wgotzman wrote:
I was looking through your posts, this post must be a clue! Something here has happened. The ignition must be miss aligned. In distributor, cam gears, belt? It really is a ignition problem. When we work on something so long we miss things. You should not have to advance distributor than much - it is a hint

You said you were using a piggy back as well. Get it out of picture for awhile. What does in control?

You may need to check distributor pickup alinement with TDC of piston and cam to confirm something. It's hard to discernible in email.

....

Then again you need to check for spark at load like I mentioned before.



Since that time I've disconnected piggyback and then also some time later changed ECU to completely stock F3 (earlier I had one with modified chip with 8200rpm limiter) - no change.

I've set ignition timing on this ECU - it's a little more stable an is set to about 11 deg advance as I recall but I can advance it further with distributor. Oooo, and earlier distributor was advanced to max because only then engine was working how it supposed to on these sport cams - it was just after installing them, but after that engine was working great for about 2 months - then I've overheated it when incorrectly set adjustable cam gears.

After changing gasket under head there was a little glitch at 5500rpm so I've started to tune piggyback again using AFR and we tried many fuel settings there but with no change - tried even very rich and very poor settings. Than once it happened during tuning - I couldn't rev above 5500rpm but after this one time it returned to only glitch.
When I went home thing started again at 5500rpm and it still occurs :/

Later my mechanic took head off and it occured that there were some hydraulic lifters that were soft (pressure problem??) (engine started to overheat with no reason some time earlier - it was in May so 5 months after blowing head gasket).
I've got new timing belt and everything was set according to manual.

I've deinstalled Nissans SR20DE 60mm throttle body (back to stock), got another TPS and set it according to service manual, got brand new genuine Suzuki MAF and ignition module, aftermarket ignition coil, spark plugs and power cables, whole distributor, fuel rail with fuel injectors and FPR, new fuel pump and fuel filter.

I have no idea what to check next...


Is relay fault possible?? Few years back I had to change main relay because from time to time during normal drive by on parking lot engine was just shutting down and I couldn't start it for about 30 seconds - after changing main relay problem was gone.

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PostPosted: Fri Feb 08, 2013 7:35 pm 
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possible to swap in the stock came and timing gears? I'm stumped otherwise.

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PostPosted: Fri Feb 08, 2013 8:00 pm 
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girlcrazy_4 wrote:
possible to swap in the stock came and timing gears? I'm stumped otherwise.


Yes - this is the next step.
Sinice few days this glitch starts also at 4300rpm and at 5500rpm still stops reving further...

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PostPosted: Sat Feb 09, 2013 7:37 pm 
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Now that i'm thinking on this. Run the car with a fuel pressure guage hooked up and see what the readings are. Mabye too much or too little pressure. Mabye a kinked fuel line not allowing sufficient flow even tho you may have proper pressure. Do a flow test if at all possible. Lastly, sometimes even brand new spark plugs crap out, double check your plug gap. If the gap is too wide, you're straining your ignition system and/or you could be prematurly "blowing out the spark"

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PostPosted: Sat Feb 09, 2013 7:42 pm 
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I've tried 3 sets of spark plugs - recommended ngk and denso and denso irydium tough.

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PostPosted: Wed Feb 13, 2013 4:31 pm 
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Hmm... I wonder what would be result if fuel pump wouldn't get enough voltage ??

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PostPosted: Fri Jun 28, 2013 10:32 am 
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any clue yet? I'm stuck with kind of the same problem as you... can rev up to 7k with a light foot, but stops at 5500 when flooring...


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PostPosted: Fri Jun 28, 2013 11:04 am 
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grasskutter1 wrote:
any clue yet? I'm stuck with kind of the same problem as you... can rev up to 7k with a light foot, but stops at 5500 when flooring...


I've also changed the ECU harness and still no change. I suspect now some kind of problem in other part of main harness (perhaps part that connects to ignition coil??) I suspect weak spark.
But there is also one thing - when we check fuel map in piggyback suddenly at about 5500rpm for a moment all fuel/ignition map disappeared and appeared again - there has to be some part of damaged cable in harness - I think.

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PostPosted: Thu Nov 19, 2015 11:32 am 
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Problem finally solved!!!!
On stock cams problem moved to 6500rpm so I suspectedd hydraulic lifters...
Problem where indeed the hydraulic valve lifters. Mine were hard after getting them out but after installing brand new from eBay that I had to import from California to Poland (took 3 weeks :/) engine finall yworks as it should!! :D

If anybody experience simillar problem - swap Your hydraulic lifters - whole set.

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PostPosted: Sat Nov 21, 2015 8:13 am 
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MKV wrote:
Problem finally solved!!!!
On stock cams problem moved to 6500rpm so I suspectedd hydraulic lifters...
Problem where indeed the hydraulic valve lifters. Mine were hard after getting them out but after installing brand new from eBay that I had to import from California to Poland (took 3 weeks :/) engine finall yworks as it should!! :D

If anybody experience simillar problem - swap Your hydraulic lifters - whole set.


Woah, who would have thought it was the lifters.

Thanks for posting an update.

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PostPosted: Wed Jan 27, 2016 12:58 am 
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So what solved your not reving problem?

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PostPosted: Wed Jan 27, 2016 2:14 pm 
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fainya wrote:
So what solved your not reving problem?


Read my last post again - new hydraulic lifters ;)

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