!!--Sr: Idle and rough running help--!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Hayaku Kenji · 09-28-2011, 08:48 PM

Background- I have been building a s13 with a s13 blacktop SR, I got the motor in only to find out it had a blown head gasket. So I pulled the motor and had the head inspected to find out it had signs of detonation. So I full rebuilt the motor. New OEM pistons new bearings, 1.5 Apexi metal head gasket and rebuilt (stock spec) head.

Got the motor back and started to rebuild. For the timing chain The motor was on TDC and the "sprocket" notch on the crank for the timing chain was at about 4 or 5 o'clock. I put the two top colored timing chain links to the notches on the cam sprockets, and the bottom one on the notch on the "sprocket" on the crank. Got everything else back on, put the motor in. At first it would not start even with starter fluid. Come to find out it needed another ground for the intake manifold. Added that ground and now it starts every time.

Problem- The motor will start and rev up like normal but will immediately die, unless I rev it. Also if I keep the motor alive at about 1,000rpm, It runs rough as crap, as if it was not running on all cylinders. It gets smoother at higher rpms (have not rev'd past 3,000). Is this sign of a not correctly set CAS? We really believe it is timing. However, we do not know how to go about it. I have numerously taken out and "set" the CAS. I do not know if I am a tooth off or not.

The motor is getting fuel. All the spark plugs are firing, with good spark. The TPS is set at .45 volts. When setting the CAS I set the motor to TDC on the compression stroke and align the CAS notch, to the right notch then put it in.

Please help me I really want this car running :'(

Hayaku Kenji · 09-28-2011, 09:09 PM

I believe I uncovered the problem. I pulled the valve cover off to check the CAS. The intake side piston 1 rocker arm has fallen off to the side. Pics in a second.

Hayaku Kenji · 09-28-2011, 09:25 PM

cotbu · 09-29-2011, 12:29 AM

Are there 2 sets? Maybe you need to measure and get the correct shims in there because I'm thinking this is at least the second time it happened to that engine.
Nevermind that you put the head back together, did you stack shims and guides or something. I'm just confused as to why, there are 2 sets and you have no clue that there are 2 guides and two shims in your hand and only one rocker is off! And the guides appear to be broken identically!

Hayaku Kenji · 09-29-2011, 05:24 AM

The machine shop was supposed to have them in the right order when I got them back so I am not completely sure. He had them labeled as to where they go. There are two set because, cylinder two did the same thing except the rocker arm stayed in place. No stacking of any sort.

Mr.GT30 · 09-29-2011, 09:37 AM

I think they put switch these shim at wrong spot,, according to the pic,, the flat one should be on left, and other one on the right. I remember they only fit in one way. if it got switch around . result is just like your broken shims.

Hayaku Kenji · 09-29-2011, 09:50 AM

So they should be like the first pic? Because they are. On all cylinders the slotted ones are on the valve closest to the front of the engine like this. 0=smooth -=slotted

REAR

0 | 0
- | -

0 | 0
- | -

0 | 0
- | -

0 | 0
- | -

Front

09-28-2011, 08:48 PM	#1
Hayaku Kenji Leaky Injector Join Date: Feb 2008 Location: Atl, Ga Age: 33 Posts: 133 Trader Rating: (0) Feedback Score: 0 reviews	!!--Sr: Idle and rough running help--!! Background- I have been building a s13 with a s13 blacktop SR, I got the motor in only to find out it had a blown head gasket. So I pulled the motor and had the head inspected to find out it had signs of detonation. So I full rebuilt the motor. New OEM pistons new bearings, 1.5 Apexi metal head gasket and rebuilt (stock spec) head. Got the motor back and started to rebuild. For the timing chain The motor was on TDC and the "sprocket" notch on the crank for the timing chain was at about 4 or 5 o'clock. I put the two top colored timing chain links to the notches on the cam sprockets, and the bottom one on the notch on the "sprocket" on the crank. Got everything else back on, put the motor in. At first it would not start even with starter fluid. Come to find out it needed another ground for the intake manifold. Added that ground and now it starts every time. Problem- The motor will start and rev up like normal but will immediately die, unless I rev it. Also if I keep the motor alive at about 1,000rpm, It runs rough as crap, as if it was not running on all cylinders. It gets smoother at higher rpms (have not rev'd past 3,000). Is this sign of a not correctly set CAS? We really believe it is timing. However, we do not know how to go about it. I have numerously taken out and "set" the CAS. I do not know if I am a tooth off or not. The motor is getting fuel. All the spark plugs are firing, with good spark. The TPS is set at .45 volts. When setting the CAS I set the motor to TDC on the compression stroke and align the CAS notch, to the right notch then put it in. Please help me I really want this car running :'(

09-29-2011, 12:29 AM	#4
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Are there 2 sets? Maybe you need to measure and get the correct shims in there because I'm thinking this is at least the second time it happened to that engine. Nevermind that you put the head back together, did you stack shims and guides or something. I'm just confused as to why, there are 2 sets and you have no clue that there are 2 guides and two shims in your hand and only one rocker is off! And the guides appear to be broken identically! __________________ LoverTechnologies "Half Broken Things!"

09-28-2011, 09:09 PM	#2
Hayaku Kenji Leaky Injector Join Date: Feb 2008 Location: Atl, Ga Age: 33 Posts: 133 Trader Rating: (0) Feedback Score: 0 reviews	I believe I uncovered the problem. I pulled the valve cover off to check the CAS. The intake side piston 1 rocker arm has fallen off to the side. Pics in a second.

09-28-2011, 09:25 PM	#3
Hayaku Kenji Leaky Injector Join Date: Feb 2008 Location: Atl, Ga Age: 33 Posts: 133 Trader Rating: (0) Feedback Score: 0 reviews

09-29-2011, 05:24 AM	#5
Hayaku Kenji Leaky Injector Join Date: Feb 2008 Location: Atl, Ga Age: 33 Posts: 133 Trader Rating: (0) Feedback Score: 0 reviews	The machine shop was supposed to have them in the right order when I got them back so I am not completely sure. He had them labeled as to where they go. There are two set because, cylinder two did the same thing except the rocker arm stayed in place. No stacking of any sort.

09-29-2011, 09:37 AM	#6
Mr.GT30 Leaky Injector Join Date: Dec 2008 Location: SoCAL Age: 38 Posts: 125 Trader Rating: (1) Feedback Score: 1 reviews	I think they put switch these shim at wrong spot,, according to the pic,, the flat one should be on left, and other one on the right. I remember they only fit in one way. if it got switch around . result is just like your broken shims.

09-29-2011, 09:50 AM	#7
Hayaku Kenji Leaky Injector Join Date: Feb 2008 Location: Atl, Ga Age: 33 Posts: 133 Trader Rating: (0) Feedback Score: 0 reviews	So they should be like the first pic? Because they are. On all cylinders the slotted ones are on the valve closest to the front of the engine like this. 0=smooth -=slotted REAR 0 \| 0 - \| - 0 \| 0 - \| - 0 \| 0 - \| - 0 \| 0 - \| - Front