I have a 1886 305 TPI in my 1950 Ford Truck project. It seemed to run fine when I bought it just driving around the block, but it has developed a problem, it idles a little rough and has no power runs like its only hitting on a couple cylinders , I have replaced cap , rotor, plugs, fuel filter. It also sounds like its pinging but it just wont go any where you can floor it and it bogs. any ideas. Thanks for the help. I just checked the timing it wwas about 21 deg btc. I just hooked up light is there something you need to do to check timing on tpi engines. I am use to the vac dist.

Thanks again

 

ttt

 

There is a connector that is in line with the harness going to the computer. Usually a tan wire, single connector. Unplug that to check your timing. Also, is it a Mass Air Flow system or Speed Density system? If Mass Air Flow, unhook the sensor from the electrical connector and see how it drives from there. If this is the problem, replace the relays. If still a problem, the Mass Air Flow sensor is bad. Start with the relays because they are cheaper. Let us know how it is going.

 

Thanks for the help it is a Mass Air Flow system.

 

ttt

 

Did you replace the sensor or the relays first? I was suggesting the relays first because they are definately cheaper and usually cause issues.

 

Sorry I have not replaced either. I put a new K&N filter on the one that was on there looked like it had collapsed . I started it up today it sound like it has a little bit of a rough idle, I was watching inline glass fuel filter between the tank an fuel pump it seems like it fills then gets a little low a lot of air bubbles and fills again never get empty but should it have a constant flow of gas? I am going to test drive tomorrow after work and disconect the mass air plug and see if it runs any better. I will let you know. Thanks for the help.

 

Did you over oil that K&N filter? I haves seen 2 seperate instances with mass air flow T/A 's where oil from a K&N got on the MAF and caused all sorts of problems. Clean off your MAF with some electro contact cleaner or similar and try it out.

 

Also, get rid of the oil soaked air filters. They will only cause problems for your MAF. You also may want to check your fuel pressure. If you have an inline filter that you can see through, you might want to get rid of that. Those filters are made for carberated cars and not fuel injected. The pressure you will need is about 43 psi. You don't want to go lower than 37 psi.

 

I test drove today ran a little better but has a very bad spark knock on light acceleration and still feels like run a liitle rough when you accelerate.. I checked the timing it is 6 btc. What should I check. Could the mass air sensor cause this. The truck seemed to be running fine 2 weeks ago. I will get fuel pressure gauge tomorrow and check fuel pressure.

 

That spark knock would be from a lean mixture (could still be MAF system). If the MAF system is sensing low voltage, it will run the system lean. Spark knock happens because of this.

 

I unhooked Mass and test drove, it runs the same. It has a bad ping on acceleration and the engine shudders. I pulled the O2 sensor it was black with carbon, it is new. Timing ok. Going to get fuel pressure gauge to check it.

 

Checked fuel pressure, 42psi key on, 36psi idle, 34 psi high rpm, key off back to 42 psi. At high rpm idle you can feel the engine kinda stumble and every now an then a slight pop. but dosen't idle too bad. When you drive it shudders and has bad ping.

 

Your pressure seems to be a little low. How new is the fuel filter? I would change that and recheck the way it drives. Make sure you don't have any vacuum leaks as well.

 

Just put it on . I will remove the glass filter betwwen the tank and pump and recheck.

 

i recommend double checking the resistance values of the componants in the DIZZY, and also a ignition control module AUTOZONE test. besure to use thermo grease when reinstalling it, or it will heat up. Its sounds like a vacuum leak, do you have a vacuum rez with a check valve to help with vacuum reserve? just a suggestion, but maybe your TPS has dead spots. your fuel lines need to be hard lines, and the return too. the tank should be pressure tested. DO you got a custom chip? did you delete the EGR? do you have the Fuel vapor canister from the 86? Is it the engine from the 1986 or the tpi system, the chip has to know* the cam and lift. THese cars are so complicated id tell you. the fuel injectors resistance should between 11.0----14.0 ohm maybe 16 ohm sometimes....is the computer talking to you(can you get trouble codes) maybe your chip or secondary chip is fried. MAYBE,,,,not saying it is AND is it *6 BTDC in TIMING MODE? or is that just how it always it. Typically one has to disconnect the EST wire, and time then reconnect. then ground the diagnostic terminal turn key to on, (not start) for 30 secs then pull the IAVC connector then turn off car, unground the terminal, then start car, and adjust the idle to 400 rpm in drive*(need the ol' lady for that one) then turn off car, reconnect the IACV then restart car. thats the proper way to set the timing AND idle, but not require EVERYTIME (never start the car with the diagnostics link grounded)

 

The motor was in the truck when I bought it he used a Painless Wireing kit for the conversion. Here is what I know. Fuel lines are hard lines, No egr. no vacuum canaster, the engine is 1986 305 TPI from a camaro, I disconneced the tan wire then checked timing. No codes I got a 12 which OK. I think it is a custme chip he had the cold start deleted. Could the knock sensor be bad.

 

i would check the dizzy