302 will not start
Thread Starter
|
New User
Joined: Feb 2004
Posts: 4
Likes: 0
From: PG
302 will not start
OK. I towed my P/u home the other day as it would'nt start. 1988 F150 4X4, 302 auto.
First I checked fuel pump relays. Working and pressure in the rail. I suspected the TFI ignition module, and replace it. No dice.
Pulled a #5 plug wire off and installed a dummy plug to verifiy spark while turning over- seems fine.
I then retrived the codes with a multimeter and got #21 - ECT out of self test range, and #24 - ACT sensor out of self test range.
Now this is where I need help-
If I read correctly neither one of these codes mean anything other than that the engine is'nt running. We have air, Fuel and spark, but no fire.
Any further insite would truly be appreciated.
Thanks
First I checked fuel pump relays. Working and pressure in the rail. I suspected the TFI ignition module, and replace it. No dice.
Pulled a #5 plug wire off and installed a dummy plug to verifiy spark while turning over- seems fine.
I then retrived the codes with a multimeter and got #21 - ECT out of self test range, and #24 - ACT sensor out of self test range.
Now this is where I need help-
If I read correctly neither one of these codes mean anything other than that the engine is'nt running. We have air, Fuel and spark, but no fire.
Any further insite would truly be appreciated.
Thanks
Senior User
Joined: Jun 2003
Posts: 175
Likes: 0
From: KS
Hey,
I came across this problem about a month ago on my friends car. We had air fuel, spark, and the timing was DEAD on. It wouldnt fire though! We figured out the problem. Although we were getting spark, the spark plugs were too big and were too far down into the cylinder! When the plug is too long and too far down in the fuel in the cylinder, it will not spark the same and give the same as you thought when you tested it. This happened to us because we bought the wrong spark plugs; they work for like 2 weeks and stop. If you recently bought some plugs, i would check those to see if its the right ones for your engine. Now this might not be your problem, but it was mine and seems like its the same as yours. Good Luck!
I came across this problem about a month ago on my friends car. We had air fuel, spark, and the timing was DEAD on. It wouldnt fire though! We figured out the problem. Although we were getting spark, the spark plugs were too big and were too far down into the cylinder! When the plug is too long and too far down in the fuel in the cylinder, it will not spark the same and give the same as you thought when you tested it. This happened to us because we bought the wrong spark plugs; they work for like 2 weeks and stop. If you recently bought some plugs, i would check those to see if its the right ones for your engine. Now this might not be your problem, but it was mine and seems like its the same as yours. Good Luck!
Elder User
Joined: Apr 2003
Posts: 627
Likes: 1
does it fire ? If you have a high mile unit the timing chain may have jumped a tooth and then it wont start period eventhough you have spark and fuel although sometimes you can adv. the dist so much that it will try but not actually run.
Thread Starter
|
New User
Joined: Feb 2004
Posts: 4
Likes: 0
From: PG
No, it does'nt fire at all and I have'nt even cracked 100,000 Kms yet. The plugs are about a year old- they were the same as the ones that came out so I really don't believe they all could fail at once, but I'll dig into it a little deeper later today.
Thanks
Thanks
Thread Starter
|
New User
Joined: Feb 2004
Posts: 4
Likes: 0
From: PG
Well, good questions. But I'm afraid I just don't know. I reconfirmed that the main pump in the frame does cycle when the key is turned on. I have a little fuel spilling out the shrader vavle on the rail, but noway of getting a pressure reading as I dont have the proper fitting for my guages.
I thought of troubleshooting the fuel system a little more by spraying gas into the intake while cranking, but it did'nt even cough. Hmmf.
I'll pull a spark plug out in the morning and check spark again and get what I need to check the fuel psi at the rail.
Thanks
I thought of troubleshooting the fuel system a little more by spraying gas into the intake while cranking, but it did'nt even cough. Hmmf.
I'll pull a spark plug out in the morning and check spark again and get what I need to check the fuel psi at the rail.
Thanks
Posting Guru
Joined: Nov 2003
Posts: 2,214
Likes: 0
From: THUNDER BAY
Even if you can hear the high press. pump in the frame the low press. pump in the tank could be pooched or 88 has that funny fuel filter in the cross over(tank to tank) switch in the frame same side as high press. pump,you have the4x4 its kinda hard to get at,its jammed beside the skid plate for the transfer case if you can get this apart oil filter wrench will work leave apart turn key on see if low press pump is pumping change filter too! somtimes too the high press pump will wher but it is still not pumping, check this the same way if you have that tool to get line apart at press. regulater hope this can help
Trending Topics
Thread Starter
|
New User
Joined: Feb 2004
Posts: 4
Likes: 0
From: PG
Ok, I just ran out of time so I had to tow the truck into the shop.
In less than a hour the guy found two things. A bad ECM ground right at the battey and corrosion at the ECM relay.
Now I don't really get this because I was able to comunicate with the ecm and it was able to turn on my fuel pump relay.
But all is running good now so I won't worry too much,
Thanks for your Help
In less than a hour the guy found two things. A bad ECM ground right at the battey and corrosion at the ECM relay.
Now I don't really get this because I was able to comunicate with the ecm and it was able to turn on my fuel pump relay.
But all is running good now so I won't worry too much,
Thanks for your Help
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
