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1968-2013 Full Size Vans Econolines. E150, E250, E350, E450 and E550

HELP!!! 1987 econoline 302 ignition issue!!!

 
  #1  
Old 05-08-2019, 10:17 AM
Mlegg0612
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HELP!!! 1987 econoline 302 ignition issue!!!

I am a decent mechanic but new to ford motors, I travel the country in my old van and Iíve been doing some tune ups and having some trouble getting the timing correct. I went to adjust my timing a few days ago and noticed my balancer has separated and slipped, so I replace the balancer and canít get timing right. The engine would run smooth in park but as soon as itís put in drive it shakes and backfires. I replaced the timing chain next and the old one had lots of slack, the new timing helped but the shake and backfire is still there. All Together Iíve got the new balancer, the new timing chain, new timing cover plate, new distributor cap and rotor, new ignition control module, new spark plugs and new wires. What could be causing the shake and backfire? All the new parts have slowly helped but not solved the problem. Now itís down to shaking only in drive at really low rpm, and a repetitive backfire at all ranges in drive. And itís a little tough to crank...
 
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Old 05-09-2019, 01:26 AM
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Originally Posted by Mlegg0612 View Post
I am a decent mechanic but new to ford motors, I travel the country in my old van and I’ve been doing some tune ups and having some trouble getting the timing correct. I went to adjust my timing a few days ago and noticed my balancer has separated and slipped, so I replace the balancer and can’t get timing right. The engine would run smooth in park but as soon as it’s put in drive it shakes and backfires. I replaced the timing chain next and the old one had lots of slack, the new timing helped but the shake and backfire is still there. All Together I’ve got the new balancer, the new timing chain, new timing cover plate, new distributor cap and rotor, new ignition control module, new spark plugs and new wires. What could be causing the shake and backfire? All the new parts have slowly helped but not solved the problem. Now it’s down to shaking only in drive at really low rpm, and a repetitive backfire at all ranges in drive. And it’s a little tough to crank...
1980/89 F100/250, E100/250 & Bronco: There are FIVE different 302 harmonic balancers, I kid you not. What was the application for the one you bought?

Do you still have the original? If so, post the ID engineering number stamped on it. On a van this old, the engine may have been replaced from one bought in a junkyard.

If the balancer doesn't match the flywheel, you'll have a vibration that will eventually tear the center from the flywheel. Not pleasant!

btw: It's shaking all the time, you just don't notice it...all the time.
 
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Old 05-09-2019, 07:03 AM
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An 87 only has one balancer application for all applications. (possibly two. one for reverse W/P on the F series, another for the cars) I would look for a vacuum leak too. Without actually being there, it could be timing, either ignition or cam timing (from the timing set installed incorrectly) but could be a vacuum leak too.
 
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Old 05-09-2019, 11:32 PM
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Originally Posted by baddad457 View Post
An 87 only has one balancer application for all applications. (possibly two. one for reverse W/P on the F series, another for the cars [it's the same puppy for all]).

I would look for a vacuum leak too. Without actually being there, it could be timing, either ignition or cam timing (from the timing set installed incorrectly) but could be a vacuum leak too.
Yes, the 1987 only has one balancer (same for all), but the OP's van is 32 years old, so is the original engine still in place or was it replaced from one bought in a junkyard?

That's why I asked the OP to post the ID number off the balancer, so we will know whether it has the original engine or not.

E4TZ-6316-A .. 302 Harmonic Balancer / Marked with ID number: E4TE-AA / Obsolete

1984/89: E150/250, F150/250, Bronco, Ford/Mercury/Lincoln Passenger Cars.
 
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Old 05-10-2019, 12:58 PM
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Originally Posted by Mlegg0612 View Post
I am a decent mechanic but new to ford motors, I travel the country in my old van and Iíve been doing some tune ups and having some trouble getting the timing correct. I went to adjust my timing a few days ago and noticed my balancer has separated and slipped, so I replace the balancer and canít get timing right. The engine would run smooth in park but as soon as itís put in drive it shakes and backfires. I replaced the timing chain next and the old one had lots of slack, the new timing helped but the shake and backfire is still there. All Together Iíve got the new balancer, the new timing chain, new timing cover plate, new distributor cap and rotor, new ignition control module, new spark plugs and new wires. What could be causing the shake and backfire? All the new parts have slowly helped but not solved the problem. Now itís down to shaking only in drive at really low rpm, and a repetitive backfire at all ranges in drive. And itís a little tough to crank...
Are you positive that some spark plug wires haven't gotten crossed? When I hear:

(1) Running okay
(2) Tune-up, spark plugs, wires, cap, rotor
(3) Runs rough, shakes, backfires

. . . I think spark plugs are connected to distributor out of order.
 
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Old 05-10-2019, 02:50 PM
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Originally Posted by CathedralCub View Post
Are you positive that some spark plug wires haven't gotten crossed? When I hear:

(1) Running okay
(2) Tune-up, spark plugs, wires, cap, rotor
(3) Runs rough, shakes, backfires

. . . I think spark plugs are connected to distributor out of order.
Yea, he may have used the wrong firing order. 87 truck would be 15426378. And the rotor turns counterclockwise.
 
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Old 05-14-2019, 09:48 PM
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I will check the spark plug wires again but I believe they are correct. I used a new oem harmonic balancer from Autozone and I believe the motor and all parts that Iíve replaced were all original before I got there. The previous owner had done some tampering of his own with the motor but as far as I know and can tell everything is original ford motor craft parts that Iíve taken off so far. A mechanic I know has told me to do a compression test because he thinks itís a bad valve, specifically an exhaust valve he thought, but I didnít want to do all that just yet if I didnít need to. Any input on that? Thanks for your help by the way
 
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Old 05-15-2019, 04:11 AM
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Originally Posted by Mlegg0612 View Post
A mechanic I know has told me to do a compression test because he thinks itís a bad valve, specifically an exhaust valve he thought, but I didnít want to do all that just yet if I didnít need to. Any input on that? Thanks for your help by the way
You're well advised to follow a mechanic's suggestion if he's seen or heard this van running. He has a huge advantage, we're speculating.

Certainly check the firing order but if that doesn't correct things its onto the compression test.
 
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Old 05-15-2019, 07:43 PM
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He is a mechanic that I know very well but he hasnít heard it, just what Iíve told him over the phone, will get back to you shortly about the compression test results
 

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