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1990 F250 cranks no start. FACTS CHECKED OK
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Kruse
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Feb 14, 2015, 12:15 PM
Post #1 of 27
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1990 F250 cranks no start. FACTS CHECKED OK
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1990 F250 gas. Cranks but no start. Checked fuel air compression timing spark. All checked ok. TPS has recently been replaced. Engine codes are 21 23 24. Any other components I should check?
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Tom Greenleaf
Ultimate Carjunky
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Feb 14, 2015, 2:45 PM
Post #2 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Will it react to a prime of starting fluid? How do you know it has fuel, compression and spark at all?
What engine - this should be fairly easy to figure out and cheap to guess - lack of fuel first then relays but say what engine,
T
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Kruse
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Feb 14, 2015, 2:57 PM
Post #3 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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It's a 351. I know it has fuel spark and everything because I tested them. I pulled the codes and got a 21 23 24. I am off work with an injury and am not able to just guess and buy parts for it. I'm sure it can be figured out but I just don't know what to test next.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 14, 2015, 3:12 PM
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Well - I'm not at a paper book that would tell what codes those cover right now but will look but really don't mean too much yet at that era.
You DO NOT KNOW YOU HAVE FUEL DELIVERED so I asked if you would try starting fluid. Just pressing the Shrader and getting fuel means nothing it has to be told to deliver fuel and have enough pressure. Pumps not so common unless you habitually run low on fuel.
Cheap parts and one that fools many is the module on side of distributor. Need a special 7/3nds socket or 5.5mm? and problem is you have to turn distributor to get at them and they'll bust off anyway if you never lubed those up. Usually those have no spark at all.
Other is how you tested spark? At coil or what? Rotor may not turn properly or timing chain if OE gave out but that would mean compression would be off as well. You really checked compression? Bet not.
If you really have all what you said it should be at least reacting so it suggests you aren't checking anything or properly.
You can in an emergency fake relays if you have A/C and an OE relay have to cut the skirt off of it to fit another. New ones fit all others under the hood.
If you want to risk it with almost no tools so far you could try turning distributor towards advanced while cranking and it might start if timing chain jumped but then need a timing wrench and timing light to even do that and put it back.
Can't do this without spending a buck for tools or parts cheaper in this case.
I don't think you have fuel pressure enough so far as a wild arse guess,
T
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Kruse
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Feb 14, 2015, 5:00 PM
Post #5 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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I did a compression test with a compression tester and a spark test with a spark tester. The fuel pressure was a push on the Schrader valve and it shot up to the roof. I don't have a fuel pressure tester anymore. The module seems to be ok with spark. I did go get a can of starting fluid and she fired and ran at high idle.
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Kruse
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Feb 14, 2015, 5:03 PM
Post #6 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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I happen to be a mechanic by trade. FYI. I am just trying to network.
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 5:07 PM
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Injector pulse? Do those trouble codes reappear in continuous memory during KOEO test after clearing memory?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
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Feb 14, 2015, 5:35 PM
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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DS - Will you take this please? Mega Blizzard ongoing and no time right now, Tom
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Kruse
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Feb 14, 2015, 5:50 PM
Post #9 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Was thinking so as well. I did get it running with the starting fluid. Idle is almost 30 and won't back down. IAC is new. Voltage to it is good. Ohms resistance read.02 on both the old one and the new one. Someone replaced it and left the old part in the cab. It won't start up again without a shot of starting fluid and goes right back to high idle. Is the tps adjustable on this year make and madel? 1990 f250
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Kruse
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Feb 14, 2015, 5:55 PM
Post #10 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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The codes are 21 ECT out of range. 23 throttle sensor out of range. 24 intake air temp out of range.
These are all KORO codes.
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 6:16 PM
Post #11 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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I know what the code numbers are. Are they coming back after you had cleared them out of the computer's memory?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 14, 2015, 6:17 PM)
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Kruse
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Feb 14, 2015, 6:21 PM
Post #12 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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The code 23 came back. I took off the IAC and reinstalled it and it went to a perfect idle after a shot of starting fluid. After about 3 min the idle went up. I checked koeo and got 23 again
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 6:28 PM
Post #13 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Take your volt meter connected to battery negative and back probe the TPS connector on the dark green/ light green wire with the ignition on.
Voltage should be between 0.73-1.22 volts with throttle closed.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Kruse
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Feb 14, 2015, 6:32 PM
Post #14 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Koeo throttle closed=4.67........MAF sensor?
(This post was edited by Kruse on Feb 14, 2015, 6:55 PM)
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Kruse
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Feb 14, 2015, 6:33 PM
Post #15 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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I unplugged the airline to maf and idle instantly dropped to normal. Plugged in and shot back up
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 6:58 PM
Post #16 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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You sure that has a MAF sensor?
If your seeing 4.67 volts on the TPS signal wire with the throttle closed, that is a problem.
What is the voltages on orange/white wire and the black/white wire at the TPS connector with the ignition on?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 14, 2015, 7:01 PM)
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Kruse
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Feb 14, 2015, 7:00 PM
Post #17 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Left side of compartment above heater motor box. 3 wires and 1 air line.
(This post was edited by Kruse on Feb 14, 2015, 7:01 PM)
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 7:02 PM
Post #18 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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That isn't a MAF sensor. That is a MAP sensor. The hose that connects to it is a vacuum line that comes from the intake manifold. The sensor measures intake manifold vacuum. Removing the hose is going to cause the computer to add fuel. That doesn't mean the sensor is bad.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 14, 2015, 7:05 PM)
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Kruse
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Feb 14, 2015, 7:04 PM
Post #19 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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I mean MAP
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Kruse
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Feb 14, 2015, 7:17 PM
Post #20 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Orange is 5.0 and black is .02
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 7:20 PM
Post #21 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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That is good. That means you have 5 volt ref and a good signal ground. Now..why 4.67 volts on the signal wire with the throttle closed? Unplug the TPS connector with the ignition on. What is the voltage on the signal wire?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 14, 2015, 7:21 PM)
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Kruse
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Feb 14, 2015, 7:26 PM
Post #22 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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.02
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Kruse
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Feb 14, 2015, 7:27 PM
Post #23 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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It looks like the stop plate for the factory idle screw is bent and the rod on top is as well.
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Discretesignals
Ultimate Carjunky
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Feb 14, 2015, 7:30 PM
Post #24 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Something wrong with your TPS sensor. Could be a defect. Don't think you can install it wrong. Doubt if the throttle is stuck wide open...lol.
If the engine puter is seeing that high of a voltage on the TPS signal wire while your cranking the engine, the engine computer is going to disable injectors or clear flood mode.
Spraying it gets it running, but when it is running the puter is still thinking your opening the throttle when your not. It will open the IAC pintle more causing a higher idle.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Kruse
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Feb 14, 2015, 7:33 PM
Post #25 of 27
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Re: 1990 F250 cranks no start. FACTS CHECKED OK
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Hmmmm. Ok. Will start there. It is brand new but like you said, it's high for sure. Are there any adjustments. Looks like that factory screw was messed with.
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