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  #16  
Old 12-10-2014, 06:40 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger sohc won't run

Its the factory engine. The 98s have the sohc. Its the year of the change
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  #17  
Old 12-10-2014, 06:40 PM
djfllmn djfllmn is offline
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Default Re: 98 ranger sohc won't run

Quote:
Originally Posted by derekq34 View Post
Its the factory engine. The 98s have the sohc. Its the year of the change
not in the ranger....they didnt get it until 2001

you have the OHV 4.0
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  #18  
Old 12-10-2014, 06:41 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger sohc won't run

I'm not near the truck or I'd look. Either way, let's just say it is because its the common engine. I'll change the thread to ohv. Do you have anything helpful?
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Old 12-10-2014, 06:44 PM
bigfisher bigfisher is offline
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Quote:
Originally Posted by derekq34 View Post
Its the factory engine. The 98s have the sohc. Its the year of the change
no they don't rangers had the OHV until 2000. Glad to see you don't know what you own.

----------

Low compression could be bad rings, cracked pistons, faulty headgasket,
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  #20  
Old 12-10-2014, 06:45 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger sohc won't run

You might be right, im not near the truck so I can't argue. Its the common engine, I changed the info up top, do you have anything helpful?
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  #21  
Old 12-10-2014, 06:46 PM
bigfisher bigfisher is offline
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Quote:
Originally Posted by derekq34 View Post
You might be right, im not near the truck so I can't argue. Its the common engine, I changed the info up top, do you have anything helpful?
see the second post.
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  #22  
Old 12-10-2014, 06:49 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger sohc won't run

Already checked all that, fresh heads, all good gaskets, rings arent bad, good fuel pressure, its firing. However when you do get it to run it only runs off of one cylinder, missfire on the others but they all have the same compression. I think it had 90 pounds, its been a few weeks since I'd messed with it. But if they all have low compression why would the one cylinder rum and no the others? The injectors are working, its in time, I think its computer
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Old 12-10-2014, 06:55 PM
djfllmn djfllmn is offline
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Default Re: 98 ranger sohc won't run

the PCM very rarely goes bad...and 90PSI of compression seems awfully low to me..should be well into the 100s

EDIT: normal compression is 130 or higher
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  #24  
Old 12-10-2014, 07:40 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger ohv won't run

it should have about 120 at the very least just to run but they all have the same so why would it miss on all but one cylinder? whats different about it? and there is no obvious reason for low compression. which makes me think that its not firing at the right time because of the computer
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Last edited by derekq34; 12-10-2014 at 07:41 PM. Reason: correction
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  #25  
Old 12-10-2014, 07:44 PM
bigfisher bigfisher is offline
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Quote:
Originally Posted by derekq34 View Post
it should have about 120 at the very least just to run but they all have the same so why would it miss on all but one cylinder? whats different about it? and there is no obvious reason for low compression. which makes me think that its not firing at the right time because of the computer
coil pack could be bad, plugs and wires could be bad
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Quote:
Originally Posted by 2004 fx4 level II
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  #26  
Old 12-10-2014, 07:45 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger sohc won't run

pulled the wires off the plug and it was still firing, in was arching from wire to plug
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  #27  
Old 12-10-2014, 07:49 PM
bigfisher bigfisher is offline
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Quote:
Originally Posted by derekq34 View Post
pulled the wires off the plug and it was still firing, in was arching from wire to plug
plug could still be bad
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  #28  
Old 12-10-2014, 07:58 PM
derekq34 derekq34 is offline
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Default Re: 98 ranger sohc won't run

Also brand new
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  #29  
Old 12-11-2014, 04:25 AM
Jswifto Jswifto is offline
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The only way to check the rings is by tearing down the bottom half of the engine. You said you did the heads and gaskets not the bottom end. Also you could have a bad cam shaft or the timing may be slipped.
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  #30  
Old 12-11-2014, 04:52 AM
modelageek modelageek is offline
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Default Re: 98 ranger sohc won't run

Quote:
Originally Posted by derekq34 View Post
I'm not near the truck or I'd look. Either way, let's just say it is because its the common engine. I'll change the thread to ohv. Do you have anything helpful?
Lol. How much more helpful could the guy be. He figured out what engine you have.

"The heads were checked by a friend (professional ) they were fine!...................."we did a valve job"........
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Last edited by modelageek; 12-11-2014 at 04:56 AM.
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