Logo
FULL SITE MENU

Intermittent Backfire

J

jcutter004

New member
"We have a 2001 Chaparral 230

"We have a 2001 Chaparral 230 SSi, 5.7 L Mercruiser Engine with about 1,000 hours on it.

It is back firing at higher speeds (around 3000 RPM). We added a fuel additive to see if it was bad gas but had no change. We had the Mariana give it a complete tune up with plugs, rotor, gaskets, air filter cleaning, gas filter, etc. However, it still backfires intermittently. We ran the gas almost completely out and added new fuel from a regular gas station but again no change. Any ideas? Jamie"
 
"Carbon build up on a piston,

"Carbon build up on a piston, cross-firing from the plug wires , weak /broken valve spring,fuel delivery issue"
 
"First check that the plug wir

"First check that the plug wires are on the correct plugs. Dont care who did what, it happens all the time.

Is this carbed? or efi?

Is it back firing thru the ""carb" or out the exhaust? Most important!!!!!
Thru "carb/intake represents a LEAN condition, Thru the exhaust represents a RICH condition.

We need more details............

1000 hours I would do a compression check and report the numbers........."
 
It is actually 360 hours on th

It is actually 360 hours on the motor. It is an EFI system and the backfire is coming out of the exhaust. Thanks Jamie
 
EFI

Sorry do not have any e

EFI

Sorry do not have any expertise with it........
Still check the plug wires for the correct placement.

I know that this been is a fix to a problem such as yours.
 
Back
Top