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Forum: TBI
Yesterday, 10:23 PM
Replies: 12
Views: 273
Posted By Schurkey

Re: loss of throttle response

1. Did you check voltage on the ground side, too?

2. Connect the scan tool. Look at the data stream especially when the engine is acting up.
Forum: TBI
Yesterday, 04:57 PM
Replies: 3
Views: 80
Posted By Schurkey

Re: Trouble starting when cold 305 TBI

Connect a scan tool, look at the data stream. I'd be especially interested in coolant temp sensor, Idle air control, and short- and long-term fuel trims.

Wouldn't hurt to verify fuel pressure,...
Forum: TBI
07-18-2019, 05:08 PM
Replies: 12
Views: 273
Posted By Schurkey

Re: loss of throttle response

Ideally, you'd be checking voltage and pressure while under load. An intermittent electrical connection could give you occasional "0" fuel pressure.

Most fuel pressure gauges have a push-button...
Forum: TBI
07-18-2019, 01:11 PM
Replies: 2
Views: 107
Posted By Schurkey

Re: Code 22 and Code 34 Car doesn't run right Need Help ASAP

Connect a scan tool, look at the data stream for clues.

What is the commanded idle speed? What is the actual idle speed? What is the IAC position, and does it change?

Yes, a cold engine would...
Forum: TBI
07-18-2019, 01:09 PM
Replies: 12
Views: 273
Posted By Schurkey

Re: loss of throttle response

WHAT VEHICLE? What engine?

As said, fuel pressure is suspect.

I would connect a scan tool and look at the data stream for clues.
Forum: TBI
07-13-2019, 05:52 PM
Replies: 10
Views: 601
Posted By Schurkey

Re: Car won’t start unless I press the gas

In MY driveway, no fuel pump gets replaced without testing the electrical supply (and ground) first. Voltage AND amperage of the supply, voltage on the ground near the pump.

In your case, I think...
Forum: TBI
07-11-2019, 03:03 AM
Replies: 10
Views: 601
Posted By Schurkey

Re: Car won’t start unless I press the gas

Yes...but expect to need a fresh fuel pump. It's not likely the filter is the only problem when there's low fuel pressure.

Poor electrical supply to the pump (including the ground side of the...
Forum: TBI
07-05-2019, 04:11 PM
Replies: 21
Views: 2,920
Posted By Schurkey

Re: what is this plug?

Ask her if she LIKES the funny angle. Some women don't want it straight. You might come out ahead on the deal.







Any chance this thread can be locked?
Forum: Carburetors
06-25-2019, 03:35 AM
Replies: 3
Views: 496
Posted By Schurkey

Re: Tbi to carb question

DualJet? That's the front half (primary) of a Quadrajet. You know, the carb with the TINY ITTY-BITTY throttle bores.

There are two CFM sizes of Dual Jet, but several different models. CFM is...
Forum: TBI
06-25-2019, 03:21 AM
Replies: 1
Views: 827
Posted By Schurkey

Re: 16168625 stalling

WHY is that thing running lean in closed loop? Is that a defect, or a tuning screw-up?

Get a scan tool connected so you can read the data stream. What is the coolant temp sensor telling the...
Forum: TBI
06-25-2019, 03:10 AM
Replies: 2
Views: 846
Posted By Schurkey

Re: Tbi to carb, fuel pump wiring

Simple solution:

Find a terminal in the fusebox that is "hot" in "Run" and "Crank", but not in "Accessory" and "Off". Route power through an oil pressure switch so if the engine stalls, the pump...
Forum: TBI
06-23-2019, 03:01 PM
Replies: 17
Views: 15,577
Posted By Schurkey

Re: putting non-coputer controlled hei in tbi motor...problems?

Awww, Fook! Got pulled into a necrothread fifteen years old!


Yup. This is crazy. There's no benefit to sabotaging the computer's engine-speed sensor system, then trying to patch it up again so...
Forum: TBI
06-21-2019, 10:15 AM
Replies: 4
Views: 1,115
Posted By Schurkey

Re: What camshaft is recommended.

"Low-end torque" camshafts tend to be very smooth.

Why would you WANT the engine to run bad at idle? Who are you impressing?

Ground a couple of plug-wires at "Cruise Night" instead.
Forum: TBI
06-13-2019, 12:12 PM
Replies: 22
Views: 339,083
Posted By Schurkey

Re: 1992 camaro 305 v8 TBI idles very high and shifts at high idles

I'm guessing your car runs and emission-tests about as good as your communication skills. Around here, they teach sentence structure, punctuation, and capitalization in about third grade.
Forum: TBI
06-12-2019, 09:58 PM
Replies: 5
Views: 1,590
Posted By Schurkey

Re: Tbi problem please help

^^^ Yes.

Fuel pressure test preferably under load--when the engine is acting up.
Connect scan tool to view data stream and read "codes".
Verify "usual" maintenance items--Fuel filter not...
Forum: TBI
06-10-2019, 11:33 PM
Replies: 39
Views: 4,808
Posted By Schurkey

Re: 5.0 TBI LO3 dyno

We've already talked about ft/lbs vs. newton-meters.
Wild Guess: Torque converter multiplying torque below stall speed

But I could be wrong, I don't see any mention of which transmission this car...
Forum: TBI
06-10-2019, 11:07 PM
Replies: 10
Views: 1,841
Posted By Schurkey

Re: L03 mods

305 is a waste of effort. Read this thread:
https://www.thirdgen.org/forums/tbi/761914-how-get-most-power.html
Forum: TBI
06-09-2019, 05:47 PM
Replies: 10
Views: 1,998
Posted By Schurkey

Re: How to get the most power out of my 305 TBI

This is SO important. THIS is why even a Chevy-design 307 has more potential than a 305. The two cubic inches mean almost nothing. The larger bore size of the 307 means everything.

The biggest...
Forum: TBI
06-08-2019, 01:17 PM
Replies: 10
Views: 1,998
Posted By Schurkey

Re: How to get the most power out of my 305 TBI

If I absolutely had to keep the 305-2V in my Nova--and I don't--I'd be looking first and foremost at aluminum cylinder heads and new pistons. The block gets whatever it needs to repair wear....
Forum: TBI
06-08-2019, 02:53 AM
Replies: 10
Views: 1,998
Posted By Schurkey

Re: How to get the most power out of my 305 TBI

The Chevy 305 is and always has been a turd. You'll spend extra money or suffer with reduced reliability trying to polish the thing.

There is ZERO reason to keep the 305 if you're on a quest for...
Forum: TBI
06-06-2019, 09:26 PM
Replies: 5
Views: 1,856
Posted By Schurkey

Re: EBL Flash First Time Use

That fuel pump is DONE. It is already in partial-failure. ...or the fuel pump wiring harness has problems supplying power to the electric pump...or the fuel filter is plugged.

You will waste a...
Forum: TBI
06-04-2019, 09:49 PM
Replies: 27
Views: 818
Posted By Schurkey

Re: Code 44/Lean Exhaust - Help Needed!

I would hope that whoever pinched the hose had enough sense to disable the diverter valve so the air blows uselessly into the air cleaner, or that they removed the belt from the AIR pump.

The AIR...
Forum: TBI
05-28-2019, 07:57 PM
Replies: 27
Views: 818
Posted By Schurkey

Re: Code 44/Lean Exhaust - Help Needed!

Broken wire for O2 sensor? O2 signal never makes it back to the ECM?

Faulty O2 sensor?
Forum: TBI
05-19-2019, 03:36 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

Might affect battery charging. Won't affect starter if the battery is charged.


Runs better above 125 degrees, but won't enter closed loop?


The first distinction among GM ignition modules...
Forum: TBI
05-19-2019, 03:15 PM
Replies: 5
Views: 391
Posted By Schurkey

Re: Hot start issue - '88 305 TBI L03

There is no "check" that can tell you the module is good. There are tests that can tell you the module is defective. This is better than nothing, but not really adequate.




1. What scan tool...
Forum: TBI
05-17-2019, 10:28 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

What was it?


Most of your questions have more than one answer. It's easier to answer the questions in reverse order.

Vacuum ball = vacuum storage so the heating system doesn't go to defrost...
Forum: TBI
05-12-2019, 10:59 PM
Replies: 8
Views: 411
Posted By Schurkey

Re: 305 tho runs great cold, rough idle, sometimes dies when warm

When was the last time you cleaned the throttle body and the idle air passage?

When was the last time you connected a scan tool and looked at the data stream?
Forum: TBI
05-11-2019, 03:15 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

Run the engine, see if the MAP readings are still goofy. Lotsa problems created by low system voltage.
Forum: TBI
05-10-2019, 04:07 PM
Replies: 11
Views: 1,343
Posted By Schurkey

Re: IAC adjustment on TBI? URGENT!!!PLEASE HELP.

That's funny!

I'm guilty of the same thing. I deliberately try to not look at who-and-where the thread originated, so that I'm not prejudiced. That means I usually don't see when the thread...
Forum: TBI
05-10-2019, 03:59 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

Engine ran smoother, but MAP voltage stayed the same? I would NOT expect that.

I'd be looking into the condition of the vacuum hose connecting the MAP sensor to vacuum, the condition of the...
Forum: TBI
05-10-2019, 02:06 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

Go ahead and leave the charger in place, if the charger is robust enough to survive throwing current into a 9--10 volt load when the starter is cranking.

Years ago, this wouldn't be an issue--I'd...
Forum: TBI
05-08-2019, 12:49 AM
Replies: 22
Views: 339,083
Posted By Schurkey

Re: 1985 Z28 camaro 305 v8 high idle 2500 rpms

Why are you posting in the TBI forum if you don't have a TBI?


Which one?

Which one? Far as I know, all the Summit carbs are 4010 style. I think Holley builds them exclusively for Summit....
Forum: TBI
05-05-2019, 07:25 PM
Replies: 50
Views: 1,040
Posted By Schurkey

Re: L03 Timing Chain Replacement

You need to push the damper on until it seats against the crankshaft timing gear. In other words, push it on until it stops moving.

Install bigass washer, and torque damper bolt to specs. DO NOT...
Forum: TBI
05-01-2019, 09:30 AM
Replies: 7
Views: 276
Posted By Schurkey

Re: Help Buildinga TPI 383

The original TBI engine in my '88 K1500 pickup had 9.25:1 compression and went 200,000+ miles.

I replaced it with a TBI crate engine from a '91 Caprice. 9.6:1 compression. That went 18 years...
Forum: TBI
04-30-2019, 10:28 PM
Replies: 7
Views: 276
Posted By Schurkey

Re: Help Buildinga TPI 383

Not my first choice. The short rods are not known for their strength. But, for <5K rpm, they should be OK.


.058 quench is a long way from ideal. Compression seems lower than stock. Why accept...
Forum: TBI
04-30-2019, 08:19 PM
Replies: 50
Views: 1,040
Posted By Schurkey

Re: L03 Timing Chain Replacement

Make sure the key that keeps the gear from turning on the crankshaft isn't somehow preventing the gear from coming off. The propane torch IS the safe option, IF (big IF) you're giving up on pulling...
Forum: TBI
04-27-2019, 05:00 PM
Replies: 50
Views: 1,040
Posted By Schurkey

Re: L03 Timing Chain Replacement

You're saying that none of the low-budget aftermarket junk timing sets have ever had a problem with misaligned keyways? Nobody has ever used the wrong keyway in a a three-keyway timing set, either.
...
Forum: TBI
04-26-2019, 01:09 PM
Replies: 50
Views: 1,040
Posted By Schurkey

Re: L03 Timing Chain Replacement

I hope you're planning to degree the camshaft while you're in there. You might be OK without doing this...but there's no way to know for sure, and fixing it means tearing the whole front back off...
Forum: TBI
04-25-2019, 01:58 AM
Replies: 6
Views: 275
Posted By Schurkey

Re: 5.7 tbi clean up

THANK YOU! Thankyouthankyouthankyou.
Forum: TBI
04-23-2019, 08:37 PM
Replies: 5
Views: 348
Posted By Schurkey

Re: 92 305 TBI Intermittent Fuel/Firing

Judging by the description, you're GUESSING that there's no fuel delivered. You haven't connected a pressure gauge to verify intermittent lack of fuel pressure, you haven't SEEN the injectors fail...
Forum: TBI
04-20-2019, 06:00 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

1. A battery can be charged, but still be defective.
2. Corroded connections at battery or at starter, including the ground side of the circuit
3. Corroded cables including the ground side
4....
Forum: TBI
04-19-2019, 05:53 PM
Replies: 35
Views: 734
Posted By Schurkey

Re: High MAP Sensor Voltage - Low Vacuum At Idle

Cranking compression varies with so many factors it's hard to keep them all straight.
Discharged battery--slow cranking speed will reduce indicated compression pressure.
High altitude will decrease...
Forum: TBI
04-18-2019, 05:11 PM
Replies: 21
Views: 584
Posted By Schurkey

Re: Crossfire dual carb

Compare the "racing" dual-four crossram manifold
http://www.camaros.org/crossram.shtml
http://www.vintagemusclecarparts.com/projects/69-302-crossram/
...
Forum: TBI
04-17-2019, 05:20 PM
Replies: 21
Views: 584
Posted By Schurkey

Re: Crossfire dual carb

There's several low-profile crossram intakes that were intended for carbs that could be modified for multi-TBI use.
Offenhauser is probably the least expensive other than an OEM Crossfire with a...
Forum: TBI
04-17-2019, 05:10 PM
Replies: 2
Views: 296
Posted By Schurkey

Re: Erratic Idle/Bogging in Gear - Solved

The photo needs to be cropped at minimum, re-posed with the camera closer would be better still. Maybe you need to include a section of tape-measure or a coin or something to provide a sense of...
Forum: TBI
04-16-2019, 06:16 PM
Replies: 5
Views: 198
Posted By Schurkey

Re: 1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

Are you changing the transmission too? The 2.8L trans isn't going to bolt to the back of a 5.7L.
Forum: TBI
04-16-2019, 06:13 PM
Replies: 3
Views: 261
Posted By Schurkey

Re: IAC Timing TPS

Connect a scan tool, look at commanded idle speed vs. actual idle speed.

Then look at the rest of the sensors and actuators--anything out-of-place or out-of-range?

I'd also be looking for...
Forum: TBI
04-16-2019, 01:15 AM
Replies: 1
Views: 140
Posted By Schurkey

Re: 4l80e limp mode problem

I don't think I can help...but I hate to see a question un-answered.

1. The computer, the wire harness, and the engine/transmission are all from a '94? Are they all from the same donor vehicle?...
Forum: TBI
04-14-2019, 11:49 PM
Replies: 15
Views: 385
Posted By Schurkey

Re: 1992 305 Pontiac idle issue

How about connecting a scan tool and LOOK AT THE DATA STREAM especially during cranking and idle when first started. Second would be to connect a fuel pressure gauge and see what the pressure is...
Forum: TBI
04-14-2019, 02:46 PM
Replies: 45
Views: 1,397
Posted By Schurkey

Re: 355 9c1

That's a mistake as far as I'm concerned.

The pump is submerged in oil. It would take thirty seconds to prime that pump, fill the oil filter and main engine oil galleries, and build pressure using...
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