popping sound?

JerryDaugherty · Sep 6, 2005

I have a popping sound every rotation... One pop in every cycle... It doesnt rev fast. These things wined like bikes but mine revs slow. i have replaced everything. could it be a blown head gasket? i guess i used ****ty ones... the car sounds good but wont idle without gas it only sounds bad the one time on the firing order...

txstang84 · Sep 6, 2005

i just sent you a pm, ck your plug wires, they're probably crossed

srothfuss · Sep 6, 2005

Yes, I agree with TX... If you recently put your motor together you probably just got a couple of wires out of order. (it can happen to the best of us)

Sicarius428 · Sep 6, 2005

Could be a lean missfire. Check for vacuume leaks too.
Kevin

JerryDaugherty · Sep 6, 2005

I will go and ck them again but im almost positive they are good... Is there anyway this could be gasket related? And I also do have a narly vac leak but cant seem to track it down... Loud like a gear drive lol... could that cause that one cylinder to pop on que everytime? its not erractic pooping its timed and w/e

Sicarius428 · Sep 6, 2005

My smog hose has a dime size hole which caused the rear passenger side cylinder to have a lean missfire. Check if the cylinders are running lean. Check the gasket between the upper and lower, TB gasket and the lower manifold gasket.
Kevin

JerryDaugherty · Sep 6, 2005

the crazy thing is i had the wrong plugs in a couple days ago and i pulled them out... #4 and #8 were charcoal black and the rest were white.... i cant remember if it was popping then but i remember it had the same idle wouldt rev fast and and drove like ****.. then i go get the right plugs 3924's and put them in..if it were running lean then why would the 2 back cylinders be running way rich? im at a loss but keep the suggestions and idea comming please thanks guys... im going to autozone right now to get a compression tester

JerryDaugherty · Sep 6, 2005

im checking my comp right now... i finished 1-4... #4 was lowest at 135 #3 was at 150 #2 was 145 and #1 was 145

1=145
2=145
3=150
4=135
Is this a problem?

ninety15.0 · Sep 6, 2005

I'm not positive but those #'s seem a tad low. I think you should be up in the 160 range and you should be lookin at about + - 10% for all your readings.

CManT1914 · Sep 6, 2005

Those numbers are fine. You're not looking for a specific number, but rather a percentage of comparison. In other words, you're looking for 15% (might be 10%, don't remember for sure) or less difference between cylinders. So you're good to go. I have 140-150 on all mine too.

EDIT: you could go back and check the rockers on cylinder 4, if you think 135 is too low. I got another 10psi out of all mine by readjusting them. They were too tight to begin with.

txstang84 · Sep 6, 2005

i agree with CMan, the numbers aren't too low, they're indicative of slightly lower static compression with a late closing intake valve...(bigger cam).

the compression variance numbers depend on where you look, for performance use, 10% is a great starting place-obviously the closer the better, but for general grocery getters, most repair manuals suggest no more than 20% (yeah, i know, ridiculous)

the rockers idea may yield you some gain as well. but as for the back two cylinders being soot fouled and the rest lean still has me guessing

txstang84 · Sep 6, 2005

hey Jerry, that black fouling-you sure it wasn't oil?

JerryDaugherty · Sep 6, 2005

ok... so all of them 1,2,5,6,7,8 all read 145 but 3 read 135 and 4 reads 150... could there be a gasket leak causing this? why the hell does it pop? I pulled all the plugs... all were fine cept #4 looks a lil lean and #8 looks lil rich... any suggestions? i figured out that 135 is 10% lower than 150.. and 145 is 7% lower than 150... IM GETTING PISSED I DONT KNOW WUT IS UP WITH THIS CAR!

JerryDaugherty · Sep 6, 2005

the fouled plugs were the wrong ones... all were really lean cept #4 and #8 they were really dark... i changed the plugs and then started it and ran it crappy .. when i pulled them to do the comp test... #4 was lil lean and #8 was a lil rich...all the rest were nice like roasted marshmellows.

txstang84 · Sep 6, 2005

lol, roasted marshmellows

<ahem> ok, back to the problem at hand-my bad, didn't notice the part about the plugs b4.

gork1rogues · Sep 7, 2005

If not the rocker settings, it sounds like an ignition problem to me.

ECU5.0 · Sep 7, 2005

checked the timing yet?

JerryDaugherty · Sep 8, 2005

well after checking to see if the plug wires were crossed about 8 times... i finalley noticed that 4 and 8 were crossed.. the 2 problem cylinders... im an idiot. thanks for al the replies.

Sicarius428 · Sep 8, 2005

Hehe. Good work though. Enjoy your new V8!
Kevin

popping sound?

JerryDaugherty

Member

txstang84

srothfuss

Last night I stabbed the same guy 7 times in a row

Sicarius428

Active Member

JerryDaugherty

Member

Sicarius428

Active Member

JerryDaugherty

Member

JerryDaugherty

Member

ninety15.0

New Member

CManT1914

New Member

txstang84

txstang84

JerryDaugherty

Member

JerryDaugherty

Member

txstang84

gork1rogues

New Member

ECU5.0

Banned

JerryDaugherty

Member

Sicarius428

Active Member

Similar threads

popping sound?

Member

Last night I stabbed the same guy 7 times in a row

Active Member

Member

Active Member

Member

Member

New Member

New Member

Member

Member

New Member

Banned

Member

Active Member

Similar threads

Privacy & Transparency

Privacy & Transparency