engine cutting out

Justin Case · Post by **Justin Case** » Sat Jan 01, 2011 8:05 pm

I was driving my Pinz at 100 kph, then it started making a burbling sound, and I lost about 5 kph. The first thing I checked was the timing, and the distributor cap and rotor. I have also checked my valve adjustment, and the condition of the spark plugs. I'm not very good with carbs. I have checked the float level, cleaned, and sync'd the carbs, (best of my ability). I have also cleaned and changed both fuel filters, and checked the fuel pump. So, it runs fine at a idle, and mid rpm range, at high rpm the front carb starts spitting gas out the top and makes a burbling type sound. Don't know if it's my ajustment or something I missed. It ran like a top for over a 1000 kms, then did this suddenly, need a little help.

edzz · Post by **edzz** » Sat Jan 01, 2011 9:52 pm

Points or electronic ignition?

Ed

Justin Case · Post by **Justin Case** » Sun Jan 02, 2011 9:48 am

electronic

edzz · Post by **edzz** » Sun Jan 02, 2011 1:30 pm

I’d be tempted to do a compression test (leak down test if you can), if for no other reason than to rule out compression related issues. Kind of grasping at straws here as I don’t have a better suggestion.

Ed

spandit · Post by **spandit** » Sun Jan 02, 2011 1:54 pm

Spitting back normally means the mixture is too weak and/or the timing is retarded so it might be worth having a play with that to start with.

Justin Case · Post by **Justin Case** » Sun Jan 02, 2011 9:34 pm

I have checked the timing again, didn't change anything. I have also changed the fuel mixture, doesn't seem to make a difference. the problem starts to build at about mid rpm. I even rechecked the valves again. I haven't done a compression test yet, hoping I missing something simple. Even checked the voltage to the ign it was at 19 volts.

milesdzyn · Post by **milesdzyn** » Sun Jan 02, 2011 10:00 pm

Put a temp guage/gun on all the cylinders, at idle and at the higher rpm where it starts to cut out, to see if there is a large diffrence in the temps of one cylinder. Getting the temps is easy and you don't have to take anything apart, it also tells you about whats going on with each individual cylinder. Once you've isolated the cylinder thats half the battle.

Miles

David Dunn · Post by **David Dunn** » Sun Jan 02, 2011 10:52 pm

Check tHe rev limiter, it could be going bad... If you're only cutting out at higher rpms.

edzz · Post by **edzz** » Sun Jan 02, 2011 11:37 pm

Possible coil issue?

http://real4x4forums.com/PinzgauerBBS/v ... oil+recall

Just a shot in the dark.

Ed

undysworld · Post by **undysworld** » Mon Jan 03, 2011 9:17 am

I'm curious why only the front carb has the spitting/burbling issues? Is it possible this has to do with a cracked intake from that carb, thus running lean? Or perhaps a valve spring which has gotten weak and only acting weird at high rpms? (I know you already checked them...)

I'd second the pyrometer to see if this shows up on just a single cylinder or more.

Also, from memory, isn't that rev-limiter easy to override? If so, you could try that and see if the problem disappears.

Jim LaGuardia · Post by **Jim LaGuardia** » Tue Jan 04, 2011 12:32 am

A few things come to mind: intake valve lash too tight or worn valve, weak fuel pump/low volume, worn accellerator pump, crossed wires.
Firing order is 1 2 4 3

I would however start with a compression test.

Justin Case · Post by **Justin Case** » Tue Jan 04, 2011 7:43 pm

I bypassed the rpm limiter with no effect. I did a compression test and got 150-145-150-145, in that order. The coil is putting out good spark. I did have a little carbon on #3 spark plug.

McCall Pinz · Post by **McCall Pinz** » Tue Jan 04, 2011 9:17 pm

Have you checked the fuel filter and the gas tank? Maybe debris in the intake tube or a filter plugged with red death? Bad accelerator pump in the carb?

Justin Case · Post by **Justin Case** » Tue Jan 04, 2011 10:27 pm

I have cleaned the fuel pump screen ( it was clean), and changed the fuel filter. I swapped the pumps when I was setting the float level to see if it made a difference, no change.

krick3tt · Post by **krick3tt** » Tue Jan 04, 2011 10:46 pm

Check the wire to the radio suppressor. Mine was holding on by one strand of the stranded wire. Can't get much voltage through that one little bit of copper, cuts out.

$.02