1993 Ford F150 runs good cold but when warmed up it started overheating and bogging down.

1hopeproductions
0

Asked by 1hopeproductions Feb 28, 2013 at 08:01 PM about the 1993 Ford F-150 XLT 4WD LB

Question type: Maintenance & Repair

I replaced the thermostat, fan clutch, and flushed the radiator(radiator was clogged at the bottom, and does look like its been changed before).  Now its bogging down instead of overheating after about 20-30 minutes of driving on the surface streets but on the freeway it gets warm and runs like crap after about 10-15 minutes. I'll let it sit for 20-30 minutes and it will run good again for a little while but will shortly do it again. Has plenty of water.   It is still getting warm but not overheating now.  I checked compression and close to 120psi across the board. Exhaust seems to be flowing as it should when its hot or cold. Any thoughts on what it could be?

15 Answers

judge_roy
Not Active

...well the waterpump may be kaput, though looks totally normal on the outside, you may even be able to wiggle the shaft, but isn't leaking out the weep hole? seen it lotsa times where the guts/fins on the pump have deteriorated to where it no longer pumps coolant very well. another complication may be a rusted water jacket, if water instead of coolant were used for any length of time would start to clobber up the coolant loop, to where controlling the temperature would be difficult-

OJ
3,760

After it had warmed up, is the top radiator hose hot? If not, you're not getting circulation through the radiator. I had a grand Torino sport in the 70's. It would do the same thing. Turned out to be the powerpack bolted onto the firewall. Engine would run like crap when it heated up. When cool, it would run fine.

OJ
3,760

You can also set the thermostat inside the vehicle to max heat and turn on the heater when the engine warms up. If the hose going to the heater core isn't hot (And I mean hot) you have a circulation problem.

judge_roy
Not Active

or unbolt and omit the t-stat, forcing it to run 'full open' to still if it still overheating~

1hopeproductions
0

Turns out, I'm losing water. Is it possible to have a blown head gasket and not lose compression? It will run fine like I said for about 30-40 minutes at this point but after that it starts to stutter and bog down.

judge_roy
Not Active

oh no say it ain't so. Look at your oilstick, hopefully it won't look like Jell0 pudding, if it does, tip off and should be taken care of right away, we really don't want coolant where oil belongs. headgasket--allright, but cracked block-NOT alright, so do your forensic analysis, as clearly you've got to stop driving this and tend to it's major problem(s).

1hopeproductions
0

No coolant in oil! Could it still be a head gasket?

judge_roy
Not Active

well yes. there are only a couple of places for this boiling hot coolant to escape to, into the cylinders thru a 35 dollar headgasket or thru a crack in the block, I have seen weirdo leaks thru and into thread cavities, but always a tale of woe with loss of coolant. Got a weekend, unbolt the head (noting the positions thru holes in a soda case) pry it up and take a looksee at your gasket to see if it looks like grannies trowsers or seems like it should be holding coolant. The coolant will leave a trace where it's leaking. You should take note of how much force it takes to loosen the head bolts, because perhaps just giving them each a quarter twist may solve the problem...tooo-

1hopeproductions
0

Well, I've taken the heads off. Took them into the shop and the only things they came back with is 2 bad exhaust valves and 1 intake valve just a little worn on each. Seems to me that if this is the case then I'm dealing with a loss of coolant with no loss of compression. Do you think it may be a crack in the block?

1hopeproductions
0

I'm leaning toward going to pic a part for another motor. What do you think?

judge_roy
Not Active

Well, you don't quite know what you're goin' ta get with a U-pull engine, I'd stray away from something like that and either get a 'crate' motor if if you are going to keep this buggy a long time go with a Jasper rebuild, sure they cost more, but every component part is either NEW or good as new, and every one of their engines is guaranteed for years...and they are painted an easily recoginized spiffy green color. ebay often has bargains what can be had for cheap, if this is your only critereon-

judge_roy
Not Active

So cracked block? you don't want to bother with where the crack is, 'cause it is akin to putting a band-aid superhero colored strip on there to cure coronary thrombosis. oy vey- gotta wonder how did this happen? manufacturing flaw? someone ran it out of coolant one day and decided to just use a garden hose to refill it? no answer will be satisfactory...new motor is the judgement...gavel down~

judge_roy
Not Active

If your heads are good yet (and sounds like they are) you could price out a "short block" from your local vendor...might save a bit of scratch~ You'd be saddled up with installing the headgaskets, but you know it'd be done right, following the torque table and spec~ components like a/c and p/s can simply be re-used.

judge_roy
Not Active

Rob, my neighbor says that you have replace the heads if the seats are burned, and have been overheated, they must be replaced...from the owner of a chevy silverado 4x4 K20 camper special silverado-

OJ
3,760

If you are going to keep the truck for any length of time do not go with the pieces parts route from another motor. I would also stay away from an engine labeled as "rebuilt". A friend was in the business prior to retirement. "Rebuilt" means repaired up to the point of initial failure. Stick with an engine labeled "remanufacturered". He suggest Jasper reman. he indicated something like the warranty is 100,000 miles. You do have to shop around for the best price. He got one dropped into my explorer for 3500.

Your Answer

Related Questions

  • i have a 77 f150 that has a problem running when it is cold 53 answers

    77 f150 351v8 . i have to start it multiple times until it stops stalling then it runs fine once warmed up

    1977 Ford F-150

    -

    Maintenance & Repair

  • 1992 f150 4x4 5.0 (running bad after engine warms up) 2 answers

    I recently bought a 1992 ford f150 4x4 5.0 This truck runs like a top near perfect for about 10 -15 minutes at first start up when motor is cold but as it warms up engine temp that is is has a lot o...

    1992 Ford F-150 XLT Lariat 4WD LB

    -

    Maintenance & Repair

  • F150 won't crank 11 answers

    I was headed down the highway one day and my truck started to bog down, so I pulled over thinking it had over heated... Radiator was full so I had it towed. Replaced the fuel pump and the truck r...

    1993 Ford F-150

    -

    Maintenance & Repair

  • My 87 Ford F150 six cylinder stalls when it gets a little warm. 11 answers

    My old work horse runs fine if the air temperature is cold, but when its warm it will stall at a stop light if a little fan comes on next to the throttle body. When you're idling at a light, if you he...

    1987 Ford F-150

    -

    Maintenance & Repair

  • 1985 f 250 302 efi, runs until it warms up then dies its not overheating, runs rough and idle surges 2 answers

    the truck starts fine when the motor is cold but when it warms up to normal operating temp it dies and wont start until it cools down but its not overheating and when i drive it it runs a little rough...

    1985 Ford F-250

    -

    Maintenance & Repair

F-150
Looking for a Used F-150 in your area?
CarGurus has 177,452 nationwide F-150 listings starting at $999.
ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 1,400
#2 dandyoun
dandyoun
Reputation 1,360
#3 kbro
kbro
Reputation 920
View All

Related Models For Sale

Used Dodge Ram Pickup 1500"
687 Great Deals out of 15,540 listings starting at $1,500
Used GMC Sierra 1500"
643 Great Deals out of 61,408 listings starting at $1,795
Used Jeep Wrangler"
601 Great Deals out of 41,780 listings starting at $1,800
Used Ford F-250"
5 Great Deals out of 799 listings starting at $1,995
Used Ford Mustang"
796 Great Deals out of 29,600 listings starting at $1,500
Used Ford Ranger"
261 Great Deals out of 7,350 listings starting at $1,499
Used Ford F-150 SVT Lightning"
5 Great Deals out of 103 listings starting at $7,999

Used Cars For Sale

2014 Ford F-150 For Sale
29 Great Deals out of 128,337 listings starting at $20,495
2013 Ford F-150 For Sale
208 Great Deals out of 11,062 listings starting at $14,990
2012 Ford F-150 For Sale
225 Great Deals out of 5,829 listings starting at $11,598
2011 Ford F-150 For Sale
292 Great Deals out of 6,901 listings starting at $7,900