Acceleration Problem - Pirate4x4.Com : 4x4 and Off-Road Forum

MadCityMike · 11-25-2003, 09:53 AM

89 D21 w/ Z24i throddle body injection 5 speed tranny 4WD starts and idles just fine. If I push real slow and steady on the accelerator pedal the engine can climb up to 5k rpm, but if I move the accelerator pedal more then slowly the engine tends to cut out and drops down to around 2k rpm and seems to run mementarily then cuts out, then runs mementarily and cuts out over and over until I release the pedal at which point it begins idling like normal.

It seemed like a fuel related issue so I've replaced the fuel filter and fuel pump. No change so I thought maybe the computer isn't telling the injectors to shoot enough fuel so I've replaced the TPS, mass air sensor and fuel pressure regulator to no avail. I've replaced the cap, rotor and wires as well. I've tried retreiving codes from the ECU, but all it does is cycle 1 - 2 - 3 - 4 -5 over and over with both red and green lights illuminating simultaniously.. My code book doesn't explain what this could mean, and it certainly isn't giving me any 2 digit codes which could help diagnose the problem.

Could the problem be in the ECU itself? Would a loose timing chain cause this acceleration problem? Is there an easy way to check the tightness of the timing chain? The only thing left that I can think of is the ignition. Where is the ignition module located on these trucks? Any insight would be greatly appreciated.

Mike

onlyonedr · 11-25-2003, 01:17 PM

Vacuum leaks? Clogged air filter (I know that's an obvious one)?

bignissan · 11-25-2003, 02:12 PM

check the coils, power transistors, ignition system...

TRed · 11-25-2003, 07:05 PM

There is a black plastic thing about 4 inches square, that is screwed to the side of the throttle body, if you take it off, it has what appears to be a filament like a light bulb, check that. That thing caused that same symptom for me with my old HB 2.4.

MadCityMike · 12-01-2003, 02:31 PM

The problem ended up being one of the coils was dead. Replaced it with a Ford EFI one and all is well.

Mike

11-25-2003, 09:53 AM	#1 (permalink)
MadCityMike Registered User Join Date: Mar 2001 Member # 3913 Location: Madison, WI Posts: 28	Acceleration Problem 89 D21 w/ Z24i throddle body injection 5 speed tranny 4WD starts and idles just fine. If I push real slow and steady on the accelerator pedal the engine can climb up to 5k rpm, but if I move the accelerator pedal more then slowly the engine tends to cut out and drops down to around 2k rpm and seems to run mementarily then cuts out, then runs mementarily and cuts out over and over until I release the pedal at which point it begins idling like normal. It seemed like a fuel related issue so I've replaced the fuel filter and fuel pump. No change so I thought maybe the computer isn't telling the injectors to shoot enough fuel so I've replaced the TPS, mass air sensor and fuel pressure regulator to no avail. I've replaced the cap, rotor and wires as well. I've tried retreiving codes from the ECU, but all it does is cycle 1 - 2 - 3 - 4 -5 over and over with both red and green lights illuminating simultaniously.. My code book doesn't explain what this could mean, and it certainly isn't giving me any 2 digit codes which could help diagnose the problem. Could the problem be in the ECU itself? Would a loose timing chain cause this acceleration problem? Is there an easy way to check the tightness of the timing chain? The only thing left that I can think of is the ignition. Where is the ignition module located on these trucks? Any insight would be greatly appreciated. Mike

11-25-2003, 02:12 PM	#3 (permalink)
bignissan Registered User Join Date: Oct 2002 Member # 14644 Location: Magnolia, Texas Posts: 2,019	check the coils, power transistors, ignition system... __________________ 1986.5 Nissan crawler - dual cases, one tons, 42's... 2003 SV650 1997 F350 DRW PSD

11-25-2003, 07:05 PM	#4 (permalink)
TRed Registered User Join Date: Jun 2002 Member # 12100 Location: Priskitt AZ Posts: 1,168	There is a black plastic thing about 4 inches square, that is screwed to the side of the throttle body, if you take it off, it has what appears to be a filament like a light bulb, check that. That thing caused that same symptom for me with my old HB 2.4. __________________ Quote: Originally Posted by randii if you're a Pickle, rolling down the trail in a Smurf, dispensing bowls of dicks. FWIW, I don't want to see pictures of that, either! Randii

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11-25-2003, 01:17 PM	#2 (permalink)
onlyonedr Registered User Join Date: May 2003 Member # 19543 Posts: 223	Vacuum leaks? Clogged air filter (I know that's an obvious one)?

12-01-2003, 02:31 PM	#5 (permalink)
MadCityMike Registered User Join Date: Mar 2001 Member # 3913 Location: Madison, WI Posts: 28	The problem ended up being one of the coils was dead. Replaced it with a Ford EFI one and all is well. Mike