1981 vw pickup gas engine
i have a hard time stating my pickup after i drive it . it turns over and over and eventually starts,i cant figure out whats wrong with it.only had it for 5 months it used to start on a dime but something went wrong
I suspect the cold start valve. I found a broken wire to mine behind the intake manifold. It just needed to be reconnected. see if you have power to the cold start valve from the thermotime switch when the engine is cold. The ground for the cold start valve is supplied from the thermotime switch for a limited time when the engine is cold.
checked the cold start valve it seems to have power for a short time while turning over the engine,could it be a weak coil?,just guessing i'm new to vw's
Start at the basics, that is wires, cap rotor, and plugs, if you aren't rocking the NGK BP6ET (#1282) you may want to invest in a set, as they are better than bosch, and I noticed vast improvements in my bunny. A general tune up. Then you probably need to set the duty cycle.
Also if you haven't replaced all the vacuum hoses on the car, vacuum leaks cause a multitude of symptoms, as well as replacing all the grounds.
Now www.cabby-info.com and http://reflectionsandshadows.com/a1-tech/ are two sites that have a wealth of information on mk1's and are cabby oriented, but the engine management is the same.
I would check fuel flow, and change the filter as well. Then go though and tune the CIS and set your duty cycle,,,,
What do Divorces, Great Coffee and Cars all have in common?
They all Start with good GROUNDS.
Replace all of them that you can, 99 percent of flakiness will disappear.
92, 93 Cabriolet.... 89, and 90 are Deceased.
There is also something called a hot start pulse relay. It gives an intermittent pulse to the cold start valve when the engine is warm. (It sounds like your starting problem is after the engine has warmed up and you are starting it again). It can be checked when the engine is warm from the cold start valve plug while turning the starter. You can ground the coil wire to the distributor to prevent starting the engine while you check it the hot start pulse relay.Originally Posted by nickster
A Haynes or Bentley manual could be helpful from the trouble shooting side. It could help you isolate the problem without experimenting with a lot of new parts that may not be necessary in the first place. One of the possible problems listed in the Haynes manual troubleshooting guide for engine starting when warm is the hot start pulse relay not working.
The cold start valve is supposed to work for a short time, so that sounds ok. From what I understand, the coil is usually an all or nothing proposition. I also believe that the coil doesn't have a lot to do with starting problems if the engine runs well once it starts.
Excuse my comment about grounding the coil wire to the distributor. The wire to the distributor from the coil should be disconnected from the center of the distributor cap and grounded to the body or engine to prevent the engine from starting when you are doing tests. It sounded like I was advising to ground the coil wire at the distributor-nix!
If all else fails you could switch to a carburetor like me and my grandfather did to our rabbits
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