Question about 1990 Nissan Pulsar

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I have a 1.8 n13 sohc pulsar that will not start. It has spark and fuel but compression seems low. Cyl 1 - 100psi, cyl 2 - 80psi, cyl 3 - 100psi and cyl 4 - 70psi. I would like to know what acceptable compression readings should be?

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It might have a damaged valves caused by slipped timing belt making the piston and valves banged each other. That is why the compressions are low. Big job.

Posted on Jun 16, 2009

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Does low compression on a 3.1 litre 1999 cause a p0303 code?


Could be a fuel injector, as long as you are getting around 150PSI in that hole I wouldn't think it would register a miss fire.

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1 Answer

I have a 1988 Yamaha Phazer 500 and it is not running on one cyl. Checked spark and good on both cyl and it has 130# of compression on both cyl


If spark and compression seemed good you may need to check the fuel. I would assume that cylinder has its own carburetor. Make sure it is working by spraying some starting fluid through the intake while the engine is running. If the cylinder starts firing you have a carb issue. The often gum up from storage or poor fuel.

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1 Answer

91 pulsar n13 has spark has fuel wont start


If spark and fuel ok, the only other thing needed will be compression. Make sure the timing belt has not broken or jumped

May 17, 2015 | Nissan Pulsar Cars & Trucks

1 Answer

What should the compression be at on a 1997 geo prizm.


which engine. the 1.6 or 1.8 toyota engine (its a corolla in snake skins) 4afe or 7afe ,
cold or hot?
warm / hot , is specified in the Factory service manual.
most cars get at least 150PSI (wide open throttle) hot (warm) , sparks out.
the compression ratio is the key factor for compression.
The 7A has 9.5 CR, way more than the 4A.
if way low on all cylinders the cam belt slipped, ever do a belt job at 60k?

here is an actual test off a good, 7afe
Compression test dry: CYL 1=210/CYL 2=200 CYL 3=205 CYL 4=205

when the belt slips the PSI can drop to 90 easy
and fail.
rules:
battery charged
spark plugs removed
block open throttle (and if smart pull fuel pump fuse)
crank until the needle goes steady. using remote start cable at starter lug, works best (safety , 3 ways)
bingo
repeat

Nov 20, 2014 | 1997 Geo Prizm

1 Answer

I have a 02 Saturn SL 1.9 SOHC I have changed 1 coil pack & spark plugs but it still misses bad & check engine light flashes


check compression ..a difference of 15 lbs compression from cyl to cyl will cause in balance. if ok check crank sensor, supplies signal for coil to fire

Nov 03, 2013 | Cars & Trucks

1 Answer

Can't get number 2 cyclinder to fire. See spark when I pull the wire off. Looks the same as number 3 but can't tell if its fuel injector issue or not enough spark?


Have you switched the spark plugs to see if it is a bad plug ?
Switching the plug in cyl 2 with another cyl will tell you if the plug is bad if the problem moves to the other cyl.
It takes alot more voltage to fire a plug in a compressed cyl than it does out in the open. If the plug is fuel soaked it will never fire.

Jun 26, 2012 | 1997 Chevrolet Cavalier

1 Answer

Replaced timing belt number 3 cyl is dead have spark and fuel and 160 psi compression but cyl 3 is dead


Make sure you have fuel and sufficient spark to that particular cylinder. If you fuel air and spark the cylinder will fire.

Mar 09, 2011 | Honda CR-V Cars & Trucks

1 Answer

My crank shaft is rotating twise the crank shaft. HOW MY 1342 FIRING WILL OCCURE?, I can spare only 30 digree for charge and spark plug contact. THERE ARE ONLY 2+2 CYLINDER. 180 DIGREE APPART KINDLY REPLY...


Your crankshaft turns 2x times the camshaft. Put it this way as # 1 cylinder reaches TDC (top dead center) of the firing/compression stroke, and this will be after a (8 degs BTDC) spark to ignite the air/fuel mix, the # 3 cyl. will be at BDC of the intake stroke and as #1 begins its power down stroke, (during explosion of air/fuel mix), #3 begins its compression up stroke, the #4 cyl. will be coming down with #1 cyl. but #4 will be in the beginning of its intake down stroke, and #2 cyl. will be coming up with #3 but #2will be in its BDC of the exhaust stroke. Which has just fired previously to #1. 1342134213421342 etc. Now the cam turns to open / close the valves; In the outline above, #1 cyl. valves will both be closed. #3 cyl. will have the intake starting to close at this point. #4 cyl. will just be starting to open its intake valve, and #2 will be starting to open its exhaust valve. Is all this clear as mud? So as the crank makes one full rotation (in a 4cyl. engine) only the firing of one cylinder has happened.and at every rotation one cyl. will fire. So #1 at TDC then one full rotation, #1 back at TDC, but this TDC is half of its 4 cycles, (1)Intake, (2)compression, (3)power, (4)exhaust. this 1234 refers to the 4 cycles of the rotation not firing order.

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1 Answer

Dead cylinders 2003 sebring


it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke.
the firing order is 1-3-4-2.
they should be hooked like this.
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Jan 23, 2009 | 2003 Chrysler Sebring

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