Having problems with your 1987 Ford Bronco ?

NO START 1. will turn over but does not start. 2. have spark, but do not have injector pulse and fuel pump relay will not energize. 3. have checked all grounds that I can find!

Posted / edited by AnonymousUser on : 27-01-2020

Answers :

Hello. You'll need t treat this as a normal no start condition and perform the following tests when it will not start. You can skip the spark check if you are sure you have it.
Here are the procedures to check for a no start on a fuel injected engine.It will require a couple diagnostic tools that you do nt most likely posess,but may be able to obtain through a tool loan or rental program at many parts stores.
In order for an engine to run it needs the following:
1. Fuel (Fuel pressure gauge)
2. Spark (In line Spark tester)
3. Injector pulse (Noid Lights)
4. Air/Compression
You must determine which one or more is missing to proceed.
You can reduce the troubleshooting by spraying carb clean or a little ether into the intake throttle body to see if it attempts to start.If it does, then there is a problem with fuel delivery and not ignition.This will tell you whether or not there is fuel being delivered and isolate the issue to fuel pressure/delivery or injector control circuits.

Check fuel pressure at test port(Schrader valve)on fuel ral for 35-45 psi.
To check for air just make sure the air filter  is not totally restricted.
To check compression install compression gauge in each cylinder,crank engine,record reading for each cylinder.Look for a big variance between cyls.
If all of this is OK you may have contaminated fuel.

Other reasons might be - Bad battery, Bad ECM, Bad Wiring.

Thanks.

Do let me know the result so that we can move further.\011

First, let's see what normally takes to start a gasoline car engine:

\015\012\015\0121. The engine must be turned over by the \015\012starter motor with enough speed to catch. For this to happen, the battery must have enough charge, the starter motor and the starter circuit should be OK.
\015\012\015\0122. Fuel mixed with air in the correct proportion must be supplied to the enigne cylinders;
\015\012\015\0123. Spark - there must be a strong spark at the proper moment to fire the air/fuel mixture.
\015\012 \015\012 4. Proper timing - the engine valves should open and close in appropriate time.
\015\012\015\0125. Compression - normal compression in the cylinders is 120 - 170 psi. The engine won't start if the compression is lower than 70 - 80 psi.

\015\012If the engine won't start - there's no magic - one of these things is\015\012probably missing. Sometimes the problem could be very hard to find, for\015\012example, when it doesn't happen at all the times. Often, though, it\015\012could be something very simple, like a dead battery.

\015\012If the car won't start, check the basic things first:
\015\012Is the battery OK? - here is a simple way to check battery: How to check the battery.\015\012Do you have oil in the engine? Is there enough fuel in the tank? - it's\015\012a very common situation when the fuel gauge isn't working properly and\015\012the car runs out of fuel with the fuel gauge still showing some fuel in\015\012the tank.
\015\012Of course, you should always consider your own personal safety when\015\012checking things under the hood or doing any work on your car. Check\015\012your car's owner's manual for safety precautions.
\015\012\015\012\015\012What happens when you are trying to start the engine?\015\012 Below\015\012are few questions that may give you an idea why a car doesn't start\015\012(follow the underlined "Yes" or "No" link). When you bring your car to\015\012a garage with a no-start problem, a mechanic may ask you similar\015\012questions; this may help him (her) to find the problem quicker.

\015\012 \015\012\015\012\015\012- Can you turn the key in the ignition? (Yes No)
\015\012- Does the "Security" or Key-shaped light flashes on the dashboard when you turn the ignition ON? (Yes No)
\015\012- When you switch the ignition ON before starting the car, does the "check engine" light come on? (Yes No )
\015\012- Do you hear the cranking sound when you're trying to start your car? (Yes No )
\015\012- Is the engine being turned over by the starter too slowly? (Yes No)
\015\012- Is the engine being turned over too fast? (Yes No)
\015\012\015\012\015\012 Before your engine died, did you experience any prior events such as:
\015\012 - leaving the lights ON overnight (Yes No)
\015\012- driving through a deep puddle, or washing the \015\012engine compartment? (Yes No)
\015\012- having only a little fuel in a tank? (Yes No)
\015\012 - having had the engine repaired recently? (Yes No)
\015\012 - extremely low oil pressure? (Yes No)
\015\012 - unusual noises such as knocking, pinging, whistling? (Yes No)
\015\012- smoking from exhaust pipe? (Yes No)

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Repair Help & Product Troubleshooting for 1987 Ford Bronco

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