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Stupid intermittent problem... '76 is making me mad....


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Well, I let my brother borrow my car today, and it messed up worse than it has ever messed up before... I had to go and try to figure out what was wrong... and I coudn't figure it out, so I limped it home....

The only thing is, it completely fixed itself by the time we got home...

 

This usually happens every few months, and I am getting sick of it... I just can't figure it out... the past few weeks, it has messed up more than a few times, but it always fixes itself... maybe somebody here can help.

 

K, here's the deal... Every once in a while, while I am driving, my car just starts missing real bad, sometimes to the point of not even being able to idle or for that matter run at all....

And other times, it just won't idle, but if I keeps the rev's above 3,000, then it runs fine there....

and other times, it will backfire really bad like it is either getting a spark at the right time (maybe mech advance hanging up)... but it will backfire no matter what the RPMs are, so that doesn't make sense...

Sometimes it will idle good, and then when I go to take off it either just dies or hesitates really bad...

 

Other times it runs perfect.... (able to burn all the way through 1st and most of the way through second)...

 

Here is what I know is not the problem:

Fuel pump

Fuel pressure regulator

Injectors

computer

lack of needed electricity

The engine is in excellent condition mechanically... good compression, etc, etc...

overheating

oil pressure

Throttle Position Sensor

bad ground (unless it is inside the car somewhere)

 

The only thing I can figure is maybe the AFM (I suspect this the most),

maybe a huge vaccum leak that I can't seem to find...(when the car messes up, I can take the oil cap off and it will still run the same... normally it will almost die)

maybe the distributor(dizzy),

or the coil(didn't help when I switched it before though, so I don't think that is it....)

 

Also, here are a few odds and ends that may help...

The cold start valve has never worked (it is good, cause if I hook it up to one of the other injector plugs and scrank the engine, gas comes out)... never have been able to trace down why it doesn't work...

 

It is not a California model, so it doesn't have all that un-necessary emmitions equipement (catylyc converter, etc)

 

If anybody has any clue as where to point me, it would be much appreciated... Thanks :-)

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hehe, I don't think it is junk floating around in the tank... when it messed up today, one of the first things I checked was the fuel system... It was working perfectly..

 

There was tons of rust in the tank when I first got the car... took forever before I got it all out... I used to have to change the filter every 2 weeks...

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Guest 240hybrid

Check your injectors for junk and deposits, fouled injectors will act like a missing engine. They need to be cleaned regualarly with the 75 NA 2.8 I used to have in my 240. I just ran injector cleaner through the system every time I changed the oil. The best way is to remove the injectors and clean them in a coffee tin full of the injector cleaner. This might be your problem.

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it will backfire really bad like it is either getting a spark at the right time (maybe mech advance hanging up)... but it will backfire no matter what the RPMs are' date=' so that doesn't make sense...

[/quote']

 

Is it backfiring from the tailpipe or intake?

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  • 2 weeks later...

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