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the only time i have seen this is when the exhaust is blocked or weak. back fire would not normally do this. replace the muffler as you say. and check that the timing lines are in the right place. have you had engine management light come on at any time while driving. if time ok and engine has no lumps while driving then it would just be the muffler fault.
The first thing I would check is fuel pressure. This type of fuel injection requires a minimum fuel pressure in order to operate. If fuel pressure is as little as one psi below minimum the vehicle will not start.
You can try squirting a couple of shots of carb spray into the air snorkel while somebody cranks the engine over. If the engine starts and then dies you now you fpdeffinetely have a fuel issue.
If the engine still won't start check for spark.
Let me know what you find.
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you may have to just to make access to some of the plugs easier so the air snorkel is not your way and the hot air tube that runs from the air cleaner to the exhaust manifold.or remove the air snorkel and the hot air tube.its not hard to move the air cleaner out of the way.
From what you've described, you have a self-draining snorkel (at least it would be if working correctly). There will be a simple diaphragm valve at the lowest point of the snorkel, it's usually made of a silicone rubber disc and in use is held closed by external water pressure. It can also be held open if there is any grit or sand in it, if it is damaged or if it's simply hardened with age.
All you can do is clean it and make sure it seats correctly. If it has failed in any way or if the diaphragm is simply missing then buy a new snorkel as they don't need to be expensive.
There's a good reason that many divers still prefer a simple j-tube snorkel and it's because there is nothing to go wrong. I personally do use a self-draining snorkel but I'm careful to inspect and clean the valve before and after every use and always have a spare snorkel in my dive bag.
On an unrelated matter, if the snorkel has any kind of device on the open end to prevent water from entering then I strongly recommend that you remove it. They're restrictive to airflow and are potentially dangerous. There is no substitute for simplicity and for learning to use a snorkel correctly.
truck normally has a vacuum hose routing diagram on under side of hood on drivers side.also look for metal tag on center of engine compartment fire wall which gives you a motor id @ and trk model # you can then know what engine vacuum diagram you need.i have a diagram for an 86 720 series Z24 carb engine that can be copied off of truck..chris
"A snorkel must fit comfortably in your mouth, allow you to purge water out of the mouthpiece and hose quickly and help you to swim efficiently. But, the most important characteristics to remember when choosing a snorkel are its length and the diameter of its barrel.
Snorkels must not be too long or too short. If a snorkel is too long it will be difficult to breathe because the barrel will fill up with carbon dioxide. Every time you breathe out carbon dioxide through your snorkel your breath must travel up and out of the barrel of your snorkel to allow you to draw oxygen back down the barrel and into your lungs. If your snorkel is too long you will only push a percentage of the carbon dioxide up and out of the barrel during your exhale. You will need to inhale oxygen before all the carbon dioxide has been pushed out; leaving the percentage of carbon dioxide entering your bloodstream higher each time you take a breath. This cycle could lead to suffocation. If a snorkel is too short it will constantly fill with water, requiring you to constantly force the water out of your snorkel which can be very exhausting.
The inside diameter of your snorkel must be approximately three quarters of an inch or 1.9 cm. If the snorkel is thinner than .75 inches it will be difficult to breathe because there will not be enough room in the barrel for you to draw enough air into your lungs. This will cause you to breathe harder and rapidly, which could cause hyperventilation. If the barrel is thicker than .75 inches it will be too large and will be uncomfortable to use and attach to your mask.
Learning to attach your snorkel to your scuba mask to make sure it is easy to grab and use is an important part of safe scuba diving practices. Snorkels are attached to the left side of your mask with a snorkel keeper. Snorkel keepers are either plastic or rubber and most use a post-hole closure. Each snorkel keeper is different and attaching your snorkel to your mask with a snorkel keeper requires practice. If you will detach your snorkel from your mask after each dive you should practice attaching your snorkel, as it can be a little tricky. Alternately, you can leave your snorkel attached to your mask if you are diving more than once in a day.
Every scuba diver spends time on the surface while preparing to descend for a dive. A snorkel allows you to conserve energy by letting you keep your head in the water while swimming and enjoying the pre-dive sights without ever having to remove your head from the water.