Truck runs like crap.

[mockspeed88]

So my truck idles low, especially in gear. Sometimes stalls. Smells rich. I replaced temp sensor, egr. All vacuum lines. New fuel pump. Has new wires and cap. Will be putting in new rotor and pickup coil. Any ideas? Headers are leaking ticking alot. I have new felpro 1404 with arp bolts to go in. Can a leak make it run that bad?

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[Supercharged111]

What's your fuel pressure?

 

[Dylan Burow]

Did you replace any ignition parts like the module or distributor recently

 

[mockspeed88]

No I haven't replaced the distributor yet. I have a new cap and rotors plus pickup module to go in. Haven't test fuel pressure. But I did just replace the fuel pump.

 

[Dylan Burow]

That might fix it (Could not) as long as it’s an OEM or good quality ignition part I cheap-ed out on some awhile ago and as soon as I came around a second time replacing ignition parts I found a rebuilt disturb in my price range and it fixed it like new.

 

[honkon]

What year is this truck? Looks like a TBI v8. Do you have any engine codes?
Exhaust leaks can confuse the o2 sensors and cause problems like this.

 

[mockspeed88]

1994 5.7 k2500

 

[Schurkey]

As said, verify fuel pressure.

Connect a scan tool, look at IAC, O2 sensor, MAP, coolant temp sensor, and all other sensors / outputs.

"Smells rich"? Likely means your catalyst is cooked from misfire.

 

[sync]

As said, verify fuel pressure.

Connect a scan tool, look at IAC, O2 sensor, MAP, coolant temp sensor, and all other sensors / outputs

Can OB1 even give you that info without a specific scanner?

 

[Schurkey]

Can OB1 even give you that info without a specific scanner?

I hear that a lot. Define "specific scanner". Folks can't believe that '95--older vehicles have a data stream because the cheap-junk "consumer-grade" code-readers and scan tools only do OBD-II.

I used a Snap-On MT / MTG 2500 for twenty-something years. Now using a Snap-On Solus Pro. There's lots of competitors to those products--OTC had the Monitor series, and later the Genysis, then Pegysis, and I don't know what they're selling now. And there's heaps of consumer-grade stuff coming in from China.

Sensor data is available on the data stream going back to some 80 1/2 model cars. You need the proper connector to fit the vehicle, and a tool with the appropriate software. In general, the older the vehicle, the slower the computer and the less info and interaction is available. But sensor data is there.

Here's what's available on my '88 K1500 through the old '2500 scan tool: (Keep in mind that the 2500 is based on a tool designed and first sold in the mid-1980s. The software got updated until Snappy quit supporting the '2500 series in 2009.)
Posts 14 and 15, but the back-story is kinda humorous.

94 k2500 no low end power and horrible fuel mileage - Automotive Forums .com Car Chat

94 k2500 no low end power and horrible fuel mileage C/K

www.automotiveforums.com

www.automotiveforums.com/vbulletin/showthread.php?t=1146067

One of these days, I should do a similar show-and-tell with the Solus Pro, and post it on this web-site, so I don't have to link off-site when this comes up again.