Warm starting is rough (sometimes) (by rough i mean very low and mor shaking, the oil light will turn off then on again for a second)


and idle is roug (always).(when car is warm: )
*cold start=smooth because of 1500-1000 rpm idle)

Idle is 670 but if I am driving and come to a stop it will stall at 1000 for a few seconds and THEN fall back to 670.

I am pretty sure it has to do with cylinder 3 being fouled. (not sure why) I don't know if it is oil, fuel,coolant, or water ( it looks like rust on tip if spark plug)

Please reference picture below-right is cyilder 2-left is cylinder 1 same mileage.

Car has FULL tune up so it's likely not any marine ve related.

I am leaning towards a intake gasket leak (tried spraying with spray bottle, but no evidence of leak-only could spray the top gasket)

Any advice/Tips much appreciated!

 

maybe a compressiion test or leakdown test might give you better insight onto whats going on in or around cylinder #3

 

was just going to say that^^


only other thing I can add clean the IACV just to help out the idle. but something is going on in that cyl. any signs of a leaking HG ?

 

Yeah B,"looks like rust" on spark plug, first thing came to mind was possible HG leak

 

Car and engine info?

Get the block test kit from AutoZone to test for exhaust gases in the coolant.

 

Thanks for the responses!!

I have not done a leak down/compression test. (But would like to)

I also heard putting a vacume gauge on the brake booster line would basically test for good engine operation. ( is that true)

I tried to diagnose a HG problem...but I have 0 signs...
(NONE OF FOLLOWING: coolant in oil/oil in coolant,water in exhaust...)

Is there a definitive test for HG?!

 

Sorry for missing car stats...

99 civic EX (D16Y8)

Engine from 00 (80k miles)

280k on body...

Manual transmission.

I did smell my coolant and it smells like gas/oil...but it could just be due to the hot plastic...

I have good power and no signs of bad HG...engine is less the 100k (and I assume they put a new HG on with new engine...

I would like to look for other fixes before condemning HG...

 

This^ tests for a blown head gasket. It's a pretty sensitive test.

There's no single test that detects all blown head gaskets. You need to do them all.

 

do the comp/leakdown can't really move forward until you rule out possibility's.

as for the vacuum gauge yes I'd recommend you get one and see here to better understand it http://www.autospeed.com/cms/A_2393/article.html

definitive way to test i'm not 100% sure but you can test the coolant system pressure which would tell you a bit imo. also are you loosing coolant tho it may be slow depletion ?