popping through tailpipe - Engine Troubleshooting


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

Drive Shaft Repair

I have a 2015 Chevy Traverse AWD. The fr...

2006 Toyoto Camry XLE Driver Side Electric Window Trouble

Hello, Looking for a little brain help ...

Tierod end change caused some kind of leak

Hello so I just took my car to the nearb...

2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes

When I bought this car in summer 2023, a...

Grounding Cable, 2017 Jeep Renegade Trailhawk

The Cable that connects my negative batt...

Rough Idle (Found new thing)

Hi everyone. First of all sorry for bad ...

equipment

hey yall. im a first year engineering st...

HELP

I have a 1956 1/2 ton panel truck, 69 35...

Howdy

    Just wanted to s...

ABS/Tractiob/Brake Lights on But No DTCs

Hello all, Recently while driving m...

popping through tailpipe

Sign up here!

Email This Post

Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

peggyfran1
User

Jan 12, 2010, 12:27 AM

Post #1 of 5 (2162 views)

popping through tailpipe	Sign In

1985 gmc pickup 350 with quadrojet.started popping like choke was sticking.put on rebuilt carb and new dist cap and rotor. not much change. still pops some and wants to die when put in gear unless you stay on the gas.just started this when it got real cold. thanks , frank

steve01832
Veteran
steve01832 profile image

Jan 12, 2010, 6:21 PM

Post #2 of 5 (2145 views)

Re: popping through tailpipe	Sign In

Hi Frank. You may want to start with a compression test. You may have a valve problem, or a jumped timing chain. Please post back with the readings of the cylinders. You really want to watch the guage on the first puff. When you crank the engine, the needle will pump up. You should get over 50 psi on the first puff. By the 3rd puff, compression should be around 140 psi, if my memory serves me correctly.

Steve

john.mahoney77
New User

Jan 13, 2010, 5:56 PM

Post #3 of 5 (2136 views)

Re: popping through tailpipe	Sign In

probly the timing chain

peggyfran1
User

Jan 14, 2010, 5:49 PM

Post #4 of 5 (2117 views)

Re: popping through tailpipe	Sign In

whats the easiest way to find out if it jumped time,if there is one ,rather than tearing it down.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 14, 2010, 6:16 PM

Post #5 of 5 (2115 views)

Re: popping through tailpipe	Sign In

One way is to set timing marks to zero by turning crankshaft bolt in one direction then count the degrees it moves turning the other way until distributor rotor moves. More than 5-6 degrees is trouble. If original chain the nylon cam gears don't age well with both age and miles too. Vacuum testing and compression testing could also be helpful.

By the time you have dug in and are looking at the thing strongly consider a new one while there! Cheap parts for the time it takes.

Some will run better for a moment if timing is advanced but take all info in for diagnosing,

T

Email This Post

Search for (options) Privacy Sitemap